Added changes and contributing guides.

Signed-off-by: Jason Lewis <jason.lewis1991@gmail.com>

Author: jasonlewis

changes.md

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+## Changes
+
+### 0.1.0 (April 7th, 2014)
+
+- Initial development release.

contributing.md

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+## Contributing to the OAuth 2.0 Server
+
+If you'd like to contribute to this package we'd like you to keep a few things in mind:
+
+1. If you're submitting a new feature then please take the time to propose the idea first. Please keep the [OAuth 2.0 specification](http://tools.ietf.org/html/rfc6749) in mind as this package avoids deviating from the specification.
+2. Any new features should initially be branched off of the `develop` branch and pull requests should target the `develop` branch.
+3. Bug fix pull requests do not require a proposal and should target the `master` branch.
+4. Always run `phpunit` after making any changes to ensure all tests pass. If adding a new feature ensure you write applicable tests.
+
+Messy pull requests will generally not be merged. Please try to keep your code neat and follow the existing coding style.
+
+Cheers and thanks for contributing!