`use Swagger\Annotations as SWG;` is now optional.
Updated Copyright to 2013
Cleaned up Swagger class

* Removed path, excludePath, cache, filelist properties
* Removed Serializable interface
* Renamed discoverServices() to scan()
* Constructor accepts an array and can now set the default api & swagger versions.
* Default to swaggerVersion 1.2

Changed UnitTest to demonstrate how to cache (and serialize).
Upgraded @SWG\Operation to 1.2 Spec