Add project text and media urls to plural overrides.
WIP
Add model for wallpostphoto.

Also add a bunch of other cleanups.
Display uploaded photo in wallpost.

The sorl image serializer now subclasses ImageField and has nice defaults.
Merge branch 'master' into media-wallpost-image-upload

Conflicts:
	apps/bluebottle_drf2/serializers.py
	apps/wallposts/serializers.py
	static/global/js/app/wallposts.js
Remove typo from previous merge.
Fix test failure.
Use AuthorSerializer in BlogPostSerializer.
Remove link from photo html.
Merge branch 'master' into media-wallpost-image-upload
Merge branch 'master' into media-wallpost-image-upload

Conflicts:
	apps/blogs/serializers.py
Properly serialize wallpost photos.
Add MediaWallPostPhoto to Ember code.

Also cleanup the JS a bit.
Install Pillow in Travis env.
Add MediaWallPostPhoto.
More cleanups.
Merge branch 'master' into media-wallpost-image-upload
Remove unused generate filename code.
Revert to using #each for errors.
Cleanups from review with Loek.