working first try of generic feed class
all empty file URLs excluded
deleting old feed classes of LatestVideos
generic ChannelFeed
deleting old ChannelFeed classes
creating generic CollectionFeed class
removing old CollectionFeed classes
LatestVideos with iTunes support
Pillow added to dependencies
Firefox recognizes podcast-feed
Collection and Channel feed with iTunes support
created MainFeed, inheritation for Feeds
fixed labels of feeds
translations for feed label changes
LAMBDA-52: do not throw exceptions
LAMBDA-52: do not use str() (utf-8 problem)
LAMBDA-52: use html for <itunes:summary>
Merge branch 'iTunes' into dev

Conflicts:
	lambdaproject/urls.py
	locale/de/LC_MESSAGES/django.po