Modified map rendering to work on ajax view and implemented links to tags

**Modified map rendering to work on ajax view**
 - Previously user's ```visited_location``` was sent from each view.
 - Which is removed and ajax call is made for map to get ```visited_location``` data.
 - This reduces burden on views to calculate and send data. Improves efficiency.

**Links to Tag's are provided**
 - Now hyperlinks are given to all the tags wherever they appears.