Adding all categories to the sidebar. Added category_list html template and adding it to base template.
Adding user profiles to the project.
Tracking Page Clickthroughs. Adding 'goto' url, 'track_url' view and updating 'category' template
Adding the function to 'like' a category. 
Updated 
* 'category' model with 'views' field
* 'base.html' for adding 'rango-ajax.js'
* 'category.html' for adding like button

Added 
* 'like_category' url, 
* 'like_category' view
* 'rango-ajax.js' file with ajax code to like a category
Added 'suggestions' functionality. 

Added
* 'suggest_category' route in urls.py
* 'suggest_category' method in views.py and update get_category_list

Updated
* ajax call in rango-ajax.js
* base.html and category_list.html templates