add admin task for unifying the slugs of episodes
fix PodcastGroup.get_podcast_by_oldid() for merged oldids
update device states in podcast states only when necessary

this optimizes saving of User objects
Merge branch 'master' of github.com:gpodder/mygpo
remove unused AUTH_PROFILE_MODULE setting
use django.contrib.staticfiles
use URI template syntax in API docs
use django.contrib.staticfiles everywhere
don't reload status page for finished task
refactor / optimize device updates
Merge branch 'master' of github.com:gpodder/mygpo
remove unused format string argument
add filter generic/is_types
move "userdata" views into own database
Merge branch 'master' into design

Conflicts:
	mygpo/web/templates/base.html
	mygpo/web/templates/embed.html
	mygpo/web/templates/episode.html
	mygpo/web/templates/home.html
	mygpo/web/templates/podcast.html
	mygpo/web/templatetags/devices.py