view: Show new playlist when current playlist is deleted

https://bugzilla.gnome.org/show_bug.cgi?id=724627
view: Show first playlist on populate if available
view: Show newly created playlist if it's the only playlist
Make the selection bar's background similar to player bar
log: add some debugs to grilo.py
Don't change view type after setting up the view
playlists: Don't crash when all items are removed

Since TotemPlParser cannot save empty playlists, insert a dummy item if all
items are removed in a playlist.
view: Set album title as Unknown Album if empty in Playlists view
Remove README.md
Make pep8 happy
Select button should be sensitive only if playlist count is greater than 0.
clear playlist model before deleting the playlist.
grilo: remove duplicate logging
log: extensive logging
grilo: don't trigger content rescan if changed file is not audio
grilo: rework add and remove clauses for content rescan
doap: update URLs
Add select all accel to app.

https://bugzilla.gnome.org/show_bug.cgi?id=727522
Don't search immideately - wait for 0.5 second
widgets: Use artist name as playlist id for Artists view

This allows the Artists view to easily lookup if the running playlist is
from itself.

https://bugzilla.gnome.org/show_bug.cgi?id=705852