Add tastypie and tastypie swagger
Add custom authentication class
Add PublicBody API
Add FoiRequest API
Connect API and API Docs
Override tastypie_swagger template
Add basic API documentation
Add custom theme template loader

Addresses this discussion:
https://github.com/fin/froide/commit/a5ef07e68b79d2eb65b6676cf318082fdb54e4eb
Move template out of helper into template dir

New template loader makes it possible again for
template dir to override app templates
Fix bad syntax on resource definitions
Improve definition of FoiAttachment API endpoint
Add API tests
Merge branch 'api'