Added fileExtension member to aid/override detection of stream type for URLs without an extension present.

Comment at line 1297 of AudioStreamer.m mentions possibly having to hard
code a file-type if the detection doesn't work based on the stream URL.
Trying to avoid this, I have added a fileExtension member that can be se
t from whatever is instantiating AudioStreamer (your view controller or
whatever) to aid it in playing these kinds of streams. If not set it wil
l continue to attempt detection based on the URL.
Xcode was defaulted to spaces instead of tabs for indenting.
Changed attribute definition after reading http://stackoverflow.com/questions/387959/nsstring-property-copy-or-retain/388002#388002

Seems copy is the appropriate choice according to the logic in this
stack overflow answer:
http://stackoverflow.com/questions/387959/nsstring-property-copy-or-retain/388002#388002
Fixed some warnings and added an AS prefix to functions.
Fixed button state problems.
Updated project and xib files for Xcode 4.4.
Merge pull request #36 from devgeeks/setFileExtension

Include an overrideable file extension property.
Included new project user files in the gitignore.
Return progress while stopping.
Fixed memory leak
Update AudioStreamer.m

Fixed issue #6
Fixed issue #6

fixed `ASAudioSessionInterruptionListener` crash issue
Merge pull request #63 from azone/patch-1

Fixed issue #6
Handle property changes on the main thread.
Merge branch 'master' of github.com:mattgallagher/AudioStreamer
Fixed warnings.
Added to gitignore
Merged gitignore
Merged gitignore