Merge pull request #358 from wraithan/master

Clean up imports
Bitbucket has a special service, too.
Initial Dash support.
Use `requests` instead of `Httplib2`, which has problems with SSL on some systems.
Add `NGINX_X_ACCEL_REDIRECT` setting. Check this instead of `DEBUG` when deciding to use the `X-Accel-Redirect` header.
Merge pull request #365 from thirstydigital/fix-ssl

Use `requests` instead of `Httplib2`, which has problems with SSL on som...
Merge pull request #362 from jezdez/dash

Initial Dash support.
Merge pull request #366 from thirstydigital/no-nginx

Add `NGINX_X_ACCEL_REDIRECT` setting. Check this instead of `DEBUG` when...
Add NGINX_X_ACCEL_REDIRECT to True in Postgres/Prod.
Revert "Add `NGINX_X_ACCEL_REDIRECT` setting. Check this instead of `DEBUG` when deciding to use the `X-Accel-Redirect` header."

This reverts commit 736847a4d80f3031200256ba6e1e8c0189730e96.
Set nginx settings in sqlite file too, for tests.
Add extra fabfile bits.
Update docs and fabfile for a single server.
flake8 vcs_support