Add functionality to get music library information like tracks, albums etc.
Added camel_to_underscore text string convinience method
Added 8 convinience methods to get the different kinds of music library information
Added credit for the information on the searches to the Janos project
Added new method names to the class doc string
Added missing tag for the albums search
Added playlists clarification, removed get_folders method, added return structure description
Resolved conflicts between master and music_lib_support