create join table users_videos
add habtm association between user and video
authenticate before create
user.videos.add(video)
add video to user's library
refactor populate_fields
install poltergeist
setup poltergeist
use PostStript fonts
autofocus signup form
autofocus signin form
content tag for video
add users_count to videos
increment/decrement users_count after add/remove
test post :create
extract sign_in method
integration test for videos
add seeds
update gems
update gems