Fixed track change event not firing correctly

Added Tests for Util class and some cleanup

Added Tests for Util class and some cleanup

Added docs for proxy usage

Added missing docs

Added label property to FullAlbum

Fixes JohnnyCrazy#199

PUT method for SeekPlayback (JohnnyCrazy#190)

Added docs for configuration

Added source to publish.cmd

Add Audio Track Analysis models and API endpoint (JohnnyCrazy#161)

* Add Audio Track Analysis models and API endpoint

* Update docs

* Add link to EchoNest archived docs for AudioAnalysis model