Ratings endpoint and Playlist addition

Added the Ratings endpoint and added to the Playlist endpoint functionality
Merge remote-tracking branch 'upstream/master'

Conflicts:
	CodingChick.BeatsMusicAPI/CodingChick.BeatsMusicAPI.Core/Base/BeatsMusicManager.cs
	CodingChick.BeatsMusicAPI/CodingChick.BeatsMusicAPI.Core/BeatsMusicClient.cs
	CodingChick.BeatsMusicAPI/CodingChick.BeatsMusicAPI.Core/Endpoints/PlaylistsEndpoint.cs
Added the ImageEndpoint

Added the ImageEndpoint and necessary infrastructure
Implemented part of Tracks endpoint
Added necessary lazy loading for Ratings in Client
Corrected usage of 'var'

Corrected usage of 'var' instead of explicit declaration
Updated to Conform to Naming Standards
Merge pull request #5 from StephenErstad/master

Ratings, Images, Tracks, and Playlists