Ajax Links - Offer main page
- Ajax calls have their own url.
- Created history state to support back functionality of browsers for
  Ajax calls.
- Index action, of offers and events, supports all the possible Ajax 
  Links provided.
- Designed the views for the offer main page.
- Created offers.js to support offer.gsp.
-Created offer controller with all the actions needed by the offers main
 page. (functionality of the map not implemented)