CircleCI

* move spec docker things into spec/support/docker/
* rake shell now copies src files into /app/ and generates nginx.conf
* rake server[fixture] will now boot an nginx server locally

Use the right variable to check the config file presence on

Restore optional nature of static.json.

Document and fix running the tests with boot2docker

Add option to redirect all http traffic to https

use ngx_mruby to implement custom headers

Verify to_regex in tests.

Don't pass port in redirects

implement testing for the buildpack