Added VolumeSnapshot to API\n\nall CRUD operations available.
Bootable Volume API is almost ready.
Merging..
Left-behinds..
Serializers use request, not request.user. Bootable volumes working
Removed api-token-auth from api-docs
Restore API authentication
Merge branch 'abyssinian-nightjar' of https://github.com/iPlantCollaborativeOpenSource/atmosphere into abyssinian-nightjar