Add Composer dependencies
Add Composer dependencies

* Package info in composer.json
* PHP >= 5.3 (I'll be using features of PHP 5.3)
* Guzzle 3.0 (any version)
* PHPUnit 3.7 (3.8 isn't compatible with PHP 5.3)
* Mockery 0.9.0

bradfeehan/guzzle-modular-service-descriptions