Merge pull request #3 from sonicbee9/develop

Merging into master.
Adding AMCoreAudioDevice+Formatters and AMCoreAudioDevice+PreferredDirections categories.
Updating header comments.
Adding AMCoreAudioManager class.
Adding AMCoreAudioManagerDelegate protocols and updating HeaderDocs.
Updating xcodeproj.
Updating podspec and CHANGELOG.md for v1.3 release