artists: don't crash on playback
artists: don't crash on load more
Remove inactivity timeout
Don't call Gtk.main_quit() on window close
Separate callback for scrollbar visibility change and adjustment change

The two signals have different number of required parameters.
Merge pull request #40 from kyoushuu/master

Fix application exit on Albums view
artists: simplify artists list rendering
artists: don't crash on undiscoverable urls
artists: code cleanup
albums: set renderer properties correctly
Load css and uncomment add_class calls
pep8 fixes
Merge pull request #41 from roignac/artist_view

Artist view
Fix renderer properties for all views and conitnue un-CamelCasing
and pep8 compatiblity
Merge pull request #42 from gnome-prototypes-team/fixes1

Fix renderer properties for all views and conitnue un-CamelCasing and pep8 compatiblity