update license, readme, and contributing for cc0

Author: benbalter

Diff for: CONTRIBUTING.md

@@ -1,5 +1,7 @@
 # Contributing to Project Open Data
 
+*By contributing to this project, you dedicate your work to the public domain and relinquish any copyright claims under the terms of the [CC0 Public Domain Dedication](http://creativecommons.org/publicdomain/zero/1.0/). See the [license file](LICENSE) for additional information.*
+
 ## How to Contribute
 
 This project constitutes a collaborative work ("open source"). Federal employees and members of the public are encouraged to improve the project by contributing. For more information, please see [the FAQ](/faq/)
@@ -38,10 +40,6 @@ Project Open Data runs on GitHub pages and automatically regenerates as a static
 
 *Note:* You'll need [Ruby](http://www.ruby-lang.org/) and the [Bundler package manager](http://gembundler.com/).
 
-## Licensing
-
-By contributing to this project, you grant a world-wide, royalty-free, perpetual, irrevocable, non-exclusive, transferable license to all users under [the same terms under which the project is licensed](README.md#licensing).
-
 ## Privacy
 
-All comments, messages, pull requests, and other submissions received through official White House pages including this GitHub page may be subject to archiving requirements. See the [readme](README.md#privacy) for more information. 
+All comments, messages, pull requests, and other submissions received through official White House pages including this GitHub page may be subject to archiving requirements. See the [readme](README.md#privacy) for more information.

Diff for: UNLICENSE.md renamed to LICENSE

@@ -22,11 +22,9 @@ For information on how to contribute, please see the [how to contribute](CONTRIB
 
 ## License
 
-The project constitutes a work of the United States Government and is not subject to domestic copyright protection under 17 USC § 105.
+The project is a public domain work and is not subject to domestic or international copyright protection. See [the license file](LICENSE) for additional information.
 
-Members of the public who wish to contribute, are encourage to do so, but by contributing, dedicate their work to the public domain and waive all rights to their contribution under US copyright law.
-
-Code contributions are dedicated to the public under the terms of the [Unlicense](unlicense.md). Contributions to the text are dedicated under the terms of the [CC0 Public Domain Dedication](http://creativecommons.org/publicdomain/zero/1.0/).
+Members of the public and US government employees who wish to contribute are encourage to do so, but by contributing, dedicate their work to the public domain and waive all rights to their contribution under the terms of the [CC0 Public Domain Dedication](http://creativecommons.org/publicdomain/zero/1.0/).
 
 ## Privacy