Added exception hanlding for gmusicapi login().
Added recent albums and artists support.
Cache recent albums and recent artists menus to be able to browse into them.
Added support for artist biography for issue #27
Better wrap lines for the note about bad gmusicapi verion.
It is possible that there is no client. For issue #26
Merge branch 'feature/recent-albums' into v0.3
Moved playlist code into Playlists module.
Merge branch 'fix/issue-19' into v0.3
Added a more detailed comment on login().
Also catch login() excpetions when trying to get the mobile device ID for issue #19.
Bump version.
Merge branch 'v0.3'