Add/delete domain,  improved GET requests and corrected back button functionality and removed OpenShift Enterprise option

Various fixes to the following issues:

* #62 - Corrected back button functionality to exit application only when previous page is the login page
* #67 - Created add/remove domain functionality
* #68 - Configured GET requests to pass in the nolinks=true query parameter
* #73 - Created link on login page to signup for OpenShift
* #74 - Removed OpenShift Enterprise login option