Add AEAudioControllerRenderMainOutput()
Merge branch 'master' of git://github.com/TheAmazingAudioEngine/TheAmazingAudioEngine
TAAE: work around iOS8 IAA + session interruption bug when current session has no audio input
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' of github.com:lijon/TheAmazingAudioEngine
Merge remote-tracking branch 'upstream/master'
Pick a thread--any thread--to render audio from offline audio controllers

Conflicts:
	TheAmazingAudioEngine/AEAudioController.m