1diff --git b/LICENSE a/LICENSE
2new file mode 100644
3index 0000000..6052e8a
4--- /dev/null
5+++ a/LICENSE
6@@ -0,0 +1,235 @@
7+
8+                                 Apache License
9+                           Version 2.0, January 2004
10+                        http://www.apache.org/licenses/
11+
12+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
13+
14+   1. Definitions.
15+
16+      "License" shall mean the terms and conditions for use, reproduction,
17+      and distribution as defined by Sections 1 through 9 of this document.
18+
19+      "Licensor" shall mean the copyright owner or entity authorized by
20+      the copyright owner that is granting the License.
21+
22+      "Legal Entity" shall mean the union of the acting entity and all
23+      other entities that control, are controlled by, or are under common
24+      control with that entity. For the purposes of this definition,
25+      "control" means (i) the power, direct or indirect, to cause the
26+      direction or management of such entity, whether by contract or
27+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
28+      outstanding shares, or (iii) beneficial ownership of such entity.
29+
30+      "You" (or "Your") shall mean an individual or Legal Entity
31+      exercising permissions granted by this License.
32+
33+      "Source" form shall mean the preferred form for making modifications,
34+      including but not limited to software source code, documentation
35+      source, and configuration files.
36+
37+      "Object" form shall mean any form resulting from mechanical
38+      transformation or translation of a Source form, including but
39+      not limited to compiled object code, generated documentation,
40+      and conversions to other media types.
41+
42+      "Work" shall mean the work of authorship, whether in Source or
43+      Object form, made available under the License, as indicated by a
44+      copyright notice that is included in or attached to the work
45+      (an example is provided in the Appendix below).
46+
47+      "Derivative Works" shall mean any work, whether in Source or Object
48+      form, that is based on (or derived from) the Work and for which the
49+      editorial revisions, annotations, elaborations, or other modifications
50+      represent, as a whole, an original work of authorship. For the purposes
51+      of this License, Derivative Works shall not include works that remain
52+      separable from, or merely link (or bind by name) to the interfaces of,
53+      the Work and Derivative Works thereof.
54+
55+      "Contribution" shall mean any work of authorship, including
56+      the original version of the Work and any modifications or additions
57+      to that Work or Derivative Works thereof, that is intentionally
58+      submitted to Licensor for inclusion in the Work by the copyright owner
59+      or by an individual or Legal Entity authorized to submit on behalf of
60+      the copyright owner. For the purposes of this definition, "submitted"
61+      means any form of electronic, verbal, or written communication sent
62+      to the Licensor or its representatives, including but not limited to
63+      communication on electronic mailing lists, source code control systems,
64+      and issue tracking systems that are managed by, or on behalf of, the
65+      Licensor for the purpose of discussing and improving the Work, but
66+      excluding communication that is conspicuously marked or otherwise
67+      designated in writing by the copyright owner as "Not a Contribution."
68+
69+      "Contributor" shall mean Licensor and any individual or Legal Entity
70+      on behalf of whom a Contribution has been received by Licensor and
71+      subsequently incorporated within the Work.
72+
73+   2. Grant of Copyright License. Subject to the terms and conditions of
74+      this License, each Contributor hereby grants to You a perpetual,
75+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
76+      copyright license to reproduce, prepare Derivative Works of,
77+      publicly display, publicly perform, sublicense, and distribute the
78+      Work and such Derivative Works in Source or Object form.
79+
80+   3. Grant of Patent License. Subject to the terms and conditions of
81+      this License, each Contributor hereby grants to You a perpetual,
82+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
83+      (except as stated in this section) patent license to make, have made,
84+      use, offer to sell, sell, import, and otherwise transfer the Work,
85+      where such license applies only to those patent claims licensable
86+      by such Contributor that are necessarily infringed by their
87+      Contribution(s) alone or by combination of their Contribution(s)
88+      with the Work to which such Contribution(s) was submitted. If You
89+      institute patent litigation against any entity (including a
90+      cross-claim or counterclaim in a lawsuit) alleging that the Work
91+      or a Contribution incorporated within the Work constitutes direct
92+      or contributory patent infringement, then any patent licenses
93+      granted to You under this License for that Work shall terminate
94+      as of the date such litigation is filed.
95+
96+   4. Redistribution. You may reproduce and distribute copies of the
97+      Work or Derivative Works thereof in any medium, with or without
98+      modifications, and in Source or Object form, provided that You
99+      meet the following conditions:
100+
101+      (a) You must give any other recipients of the Work or
102+          Derivative Works a copy of this License; and
103+
104+      (b) You must cause any modified files to carry prominent notices
105+          stating that You changed the files; and
106+
107+      (c) You must retain, in the Source form of any Derivative Works
108+          that You distribute, all copyright, patent, trademark, and
109+          attribution notices from the Source form of the Work,
110+          excluding those notices that do not pertain to any part of
111+          the Derivative Works; and
112+
113+      (d) If the Work includes a "NOTICE" text file as part of its
114+          distribution, then any Derivative Works that You distribute must
115+          include a readable copy of the attribution notices contained
116+          within such NOTICE file, excluding those notices that do not
117+          pertain to any part of the Derivative Works, in at least one
118+          of the following places: within a NOTICE text file distributed
119+          as part of the Derivative Works; within the Source form or
120+          documentation, if provided along with the Derivative Works; or,
121+          within a display generated by the Derivative Works, if and
122+          wherever such third-party notices normally appear. The contents
123+          of the NOTICE file are for informational purposes only and
124+          do not modify the License. You may add Your own attribution
125+          notices within Derivative Works that You distribute, alongside
126+          or as an addendum to the NOTICE text from the Work, provided
127+          that such additional attribution notices cannot be construed
128+          as modifying the License.
129+
130+      You may add Your own copyright statement to Your modifications and
131+      may provide additional or different license terms and conditions
132+      for use, reproduction, or distribution of Your modifications, or
133+      for any such Derivative Works as a whole, provided Your use,
134+      reproduction, and distribution of the Work otherwise complies with
135+      the conditions stated in this License.
136+
137+   5. Submission of Contributions. Unless You explicitly state otherwise,
138+      any Contribution intentionally submitted for inclusion in the Work
139+      by You to the Licensor shall be under the terms and conditions of
140+      this License, without any additional terms or conditions.
141+      Notwithstanding the above, nothing herein shall supersede or modify
142+      the terms of any separate license agreement you may have executed
143+      with Licensor regarding such Contributions.
144+
145+   6. Trademarks. This License does not grant permission to use the trade
146+      names, trademarks, service marks, or product names of the Licensor,
147+      except as required for reasonable and customary use in describing the
148+      origin of the Work and reproducing the content of the NOTICE file.
149+
150+   7. Disclaimer of Warranty. Unless required by applicable law or
151+      agreed to in writing, Licensor provides the Work (and each
152+      Contributor provides its Contributions) on an "AS IS" BASIS,
153+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
154+      implied, including, without limitation, any warranties or conditions
155+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
156+      PARTICULAR PURPOSE. You are solely responsible for determining the
157+      appropriateness of using or redistributing the Work and assume any
158+      risks associated with Your exercise of permissions under this License.
159+
160+   8. Limitation of Liability. In no event and under no legal theory,
161+      whether in tort (including negligence), contract, or otherwise,
162+      unless required by applicable law (such as deliberate and grossly
163+      negligent acts) or agreed to in writing, shall any Contributor be
164+      liable to You for damages, including any direct, indirect, special,
165+      incidental, or consequential damages of any character arising as a
166+      result of this License or out of the use or inability to use the
167+      Work (including but not limited to damages for loss of goodwill,
168+      work stoppage, computer failure or malfunction, or any and all
169+      other commercial damages or losses), even if such Contributor
170+      has been advised of the possibility of such damages.
171+
172+   9. Accepting Warranty or Additional Liability. While redistributing
173+      the Work or Derivative Works thereof, You may choose to offer,
174+      and charge a fee for, acceptance of support, warranty, indemnity,
175+      or other liability obligations and/or rights consistent with this
176+      License. However, in accepting such obligations, You may act only
177+      on Your own behalf and on Your sole responsibility, not on behalf
178+      of any other Contributor, and only if You agree to indemnify,
179+      defend, and hold each Contributor harmless for any liability
180+      incurred by, or claims asserted against, such Contributor by reason
181+      of your accepting any such warranty or additional liability.
182+
183+   END OF TERMS AND CONDITIONS
184+
185+   APPENDIX: How to apply the Apache License to your work.
186+
187+      To apply the Apache License to your work, attach the following
188+      boilerplate notice, with the fields enclosed by brackets "[]"
189+      replaced with your own identifying information. (Don't include
190+      the brackets!)  The text should be enclosed in the appropriate
191+      comment syntax for the file format. We also recommend that a
192+      file or class name and description of purpose be included on the
193+      same "printed page" as the copyright notice for easier
194+      identification within third-party archives.
195+
196+   Copyright [yyyy] [name of copyright owner]
197+
198+   Licensed under the Apache License, Version 2.0 (the "License");
199+   you may not use this file except in compliance with the License.
200+   You may obtain a copy of the License at
201+
202+       http://www.apache.org/licenses/LICENSE-2.0
203+
204+   Unless required by applicable law or agreed to in writing, software
205+   distributed under the License is distributed on an "AS IS" BASIS,
206+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
207+   See the License for the specific language governing permissions and
208+   limitations under the License.
209+
210+---
211+
212+// Copyright 2017 The Chromium OS Authors. All rights reserved.
213+//
214+// Redistribution and use in source and binary forms, with or without
215+// modification, are permitted provided that the following conditions are
216+// met:
217+//
218+//    * Redistributions of source code must retain the above copyright
219+// notice, this list of conditions and the following disclaimer.
220+//    * Redistributions in binary form must reproduce the above
221+// copyright notice, this list of conditions and the following disclaimer
222+// in the documentation and/or other materials provided with the
223+// distribution.
224+//    * Neither the name of Google Inc. nor the names of its
225+// contributors may be used to endorse or promote products derived from
226+// this software without specific prior written permission.
227+//
228+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
229+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
230+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
231+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
232+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
233+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
234+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
235+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
236+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
237+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
238+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
239+
240+---
241+
242