* Refactored PermissionResolver to use PermissionResolver and ParentResolver instead of URIs.
* Refactored crypto package in utilities.
Added new methods to SimpleCipher.
Added annotations for permission checking.
Refactored permission services to make them more general, and added annotations for handling permission checking.
Added SimpleCipherTest.
Merge branch 'master' of https://github.com/craftercms/commons
Removed Spring dependencies.
Merge pull request #8 from avasquez614/master

Added permission services (work in progress)