Fixes Issue #257

- headers_more_module failed to compile due to simple path issues.
This fixes that.
Apparnently File.exist is preferred over File.exists

See https://travis-ci.org/miketheman/nginx/jobs/36982759
Merge branch 'master' of https://github.com/josh-padnick/nginx into josh-padnick-master
remove extra commands from headers_more, tests

The mv/rm lines in the headers_more module are no longer used.

- Add ChefSpec tests
- Add Test Kitchen tests

Refs #279
Closes #227, #257