added zendesk_engine gem and routes
updated zendesk_engine gem and added configuration for zendesk integration
adjusting the feedback form to send info to zendesk engine controller via AJAX [13114659]
added thank you message and handled submit to zendesk in feedback form [13114659]
using API url as another parameter in initializer
Merge pull request #775 from diogob/bootstrap

Bootstrap - Added Zendesk Engine and feedback box