Merge pull request #7 from reggna/pr-2

Fix crash in list_playlists()
Switched to the new Webclient interface
Fixed the rest of the get_stream_url </high_embarrassment_factor>
get_stream_urls should be get_stream_url for the latest release (get_stream_urls is currently in the dev branch). Fixed
Merge from mstill
Moved to Mobileclient because webclient did not seem to work anymore
Merge in some changes. Get it working with gmusicapi develop branch