POST for single EncodedVideo

POST for EncodedVideo implemented. Can now upload a single Video
with multiple EncodedVideos with profile_name as it's profile.
Cannot do any bulk operations. Serializers have been simplified.
Views are now using genericviews.

Other notes:
-Added django-debug-toolbar==1.2.1
-constants.py has been reorganized
-api.get_video_info uses new serializer