Removed a couple of unused constants
Addressed a mixer buffer issue when timestamp is missing
Tweaked float converter cleanup
Updated TPCircularBuffer
Removed hardware latency compensation code in favour of giving control to developers

See AEAudioController{Input,Output}Latency
Updated podspec
Removed now-illegal comments from podspec
Modified createChannelGroupWithinChannelGroup to update bus count on parentGroup->mixerAudioUnit
Merge pull request #84 from jayrhynas/subgroup-mixer-bus-count

Fixed limit of 8 sub-channel-groups
render from any thread
make audio unit channel more amenable to subclassing

declare _audioUnit in header
record timestamp in audio render callback
Merge branch 'render' into djz