Added CHANGELOG.md following http://keepachangelog.com/ format

Changed LICENSE from plain-text to Markdown

CHANGELOG.md

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+# Change Log
+All notable changes to this project will be documented in this file.
+This project adheres to [Semantic Versioning](http://semver.org/).
+
+## [Unreleased][unreleased]
+### Added
+- Token functionality for client-sided pairing
+- Set payout bitcoin amount, as returned by BitPay
+
+### Changed
+- Documentation from RST to Markdown
+
+## [2.2.2] - 2015-01-13
+### Added
+- Mink/Behat testing
+
+### Fixed
+- Corrected behavior of Math::mod
+
+## [2.2.1] - 2014-12-10
+### Added
+- Payroll feature
+- Detailed tutorials
+
+### Fixed
+- Math Engine issues
+- Stalling tests
+
+## [2.2.0] - 2014-11-21
+### Changed
+- No longer solely depends on GMP for big integer math. Can now use BCMath as well
+
+## [2.1.1] - 2014-11-19
+### Changed
+- Encrypted file storage is now default persistance for keys
+
+### Fixed
+- McryptExtensionTest no longer fails randomly
+
+### Removed
+- PHP 5.3 support.  Now requires PHP >= 5.4
+
+## [2.1.0] - 2014-11-10
+### Added
+- Code Coverage tools
+- Integration testing
+- CA Bundle for Curl Adapter
+- Additional invoice tests
+- PEM Encoding and Decoding
+- Storage Class tutorial
+- `fullNotifications` for invoices
+
+### Changed
+- Point arrays to objects
+- Better exception handling for Curl errors
+- Refactored `isGenerated`
+
+### Fixed
+- MCrypt cipher type default is now a valid cipher type
+
+## 2.0.0 - 2014-09-27
+### Changed
+- Client library now uses BitPay's new API
+
+[unreleased]: https://github.com/bitpay/php-bitpay-client/compare/v2.2.2...HEAD
+[2.2.2]: https://github.com/bitpay/php-bitpay-client/compare/v2.2.1...v2.2.2
+[2.2.1]: https://github.com/bitpay/php-bitpay-client/compare/v2.2.0...v2.2.1
+[2.2.0]: https://github.com/bitpay/php-bitpay-client/compare/v2.1.1...v2.2.0
+[2.1.1]: https://github.com/bitpay/php-bitpay-client/compare/v2.1.0...v2.1.1
+[2.1.0]: https://github.com/bitpay/php-bitpay-client/compare/v2.0.0...v2.1.0

LICENSE

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-The MIT License (MIT)
-
-Copyright (c) 2014 BitPay, Inc.
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.

LICENSE.md

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+# The MIT License (MIT)
+
+Copyright © 2015 BitPay
+
+> Permission is hereby granted, free of charge, to any person obtaining a copy
+> of this software and associated documentation files (the "Software"), to deal
+> in the Software without restriction, including without limitation the rights
+> to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+> copies of the Software, and to permit persons to whom the Software is
+> furnished to do so, subject to the following conditions:
+>
+> The above copyright notice and this permission notice shall be included in
+> all copies or substantial portions of the Software.
+>
+> THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+> IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+> FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+> AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+> LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+> OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+> THE SOFTWARE.