Redesign of CSS/Site layout

- Added custom CSS classes
- Changed site structure i regard of views
- Added helper method to ```document_helper```
- Refactored cukes and specs to reflect new layout
- Precompiled Assets Pipeline 

Pivotal Tracker [chore](https://www.pivotaltracker.com/story/show/64304004) and [part of feature](https://www.pivotaltracker.com/story/show/64107430)