Use configured user/group instead of root

* Refactor handler + location intialization, allow module variables for handlers
* Add location handling + refactor Fast-CGI response handling
* Add location configuration
* Documentation + minor refactoring
* Refactoring, integrate ebernhardson/fastcgi library for testing purposes
* Add new FastCGI module
* Change from 0.1 sec to 1 sec sleep to create new workers