Adding Android implementation (in progress.)
Add a desctuctor to SoundController.
Support cutting off the path for iOS (so loading sounds/beep.wav will load beep.wav in the flat iOS file structure.)
FIx some style, and also doesn't assume sounds are in "sounds" folder in Android. Fixed iOS instead to look for flat file structure.
[Android] Init functions return bool instead of object pointer. AndroidSound uses vector instead of linked-list for AndroidSoundInstance's.
Fixed title in README.md.