Added loader.js so you don't need to manually include each file

This way, just one file to include for the core IodineGBA library. 'course, you still need your glue code.
Everything needs to be loaded before onload, swfobject needs to be in <head>, and typedarrayshim loaded before the other Iodinegba files. XAudioJS files aren't order dependent, but get initialized at onload by a user script.