move accounts/user model signals to its own file
move user related signal out of reader models
fixes to get testing working
initial reader signals file
add library for validating/parsing feeds
treat lib dir as a python package
use a valid feed url for posting
add validation for checking if a url for a feed is valid
initial signal for populating articles after creating a feed
test invalid feed urls raise a validation exception
remove lib folder for now until its really necessary
initialize all feeds except url as read only

+ other fields will be populated automatically on write
move feed validtion into the clean_fields function
only use the feed title if no title was set
don't make title read only and make title not required
don't provide the title when posting
initial utils file includes function for populating articles for a feed
implement refresh action for FeedViewSet
for now don't use post save signal for populating articles of a feed
add functions for testing refreshing a feed

- also cleaned up code (removed tests testing authentication)