Added a lot of functionality and refactored code

Changes
* Controllers all in index.js
* Changed routes

Functionality
+ LOGIN
+ HOME
+ CLASS partially
+ CHALLENGE partially
+ LEADERBOARD
+ CLASSPROFILE partially
+ PROFILE partially

Still missing
- ADDCLASS
- SIGNUP
- CLASSPROFILE charts, etc.
- PROFILE charts, class tabs, etc.
- CHALLENGE rat race, etc.
- Menus
- EDITPROFILE
Added ADDCLASS and fixed menus