Assume a universal content type acceptor when not provided
Add tabular collection views to the lists of paths to be invalidated in the cache
Set allowed hosts in the dotcloud postinstall
Only allow JSON, JSONP, and CSV rendering.

The browsable API renderers in DRF are broken with newer versions of Django. Rather than worry about updating those renderers, we'll just remove them.
Rename sa_api package to sa_api_v2
Merge branch 'apiv1' into apiv2

- Update the cache clearing to clear tabular results from the cache as well
- Update the renderers to exclude browsable API, as it's broken with Django>=1.5 and DRF<2
- Allow all hosts explicitly, for Django >= 1.5

Conflicts:
	src/sa_api_v1/cache.py