Merge pull request #34 from ablinov/master

Removed test code
Udpated podspec to 0.0.7
Added mute and unmute methods
Update podspec version 0.0.8
Adding some casts to get rid of Xcode warnings.
Merge pull request #36 from kevinrenskers/master

Added mute and unmute methods, increased version to 0.0.8
Adding level metering APIs, similar to those in AVAudioPlayer.
Merge pull request #37 from johnboiles/master

Adding level metering APIs. Adding casts to get rid of Xcode warnings.
Tidied up code
Updated Audjustable.podspec to 0.0.9
Added logging support