Add new Getting Started page

Modified content in start-en.hbs to match the new theme, 
Added page specific css in content/_base,scss
Modified colours in main/_base.scss and footer/_base.scss
Modified link colours in _variables.scss 
@pjackson28 So far adding conditionals this way in the default.hbs file is working, but is this the correct way?
For changing the position of the site wide alert box: 
![capture](https://cloud.githubusercontent.com/assets/4314923/3665065/5b7ce8ba-11e2-11e4-8008-4e33785e0f66.JPG)

I can't think of another easy way to do this without dirtying the code too much. Considering the fact that we'll be conducting a usability testing on the WET website at Codefest on the new design, these changes would need to appear on several pages as well in order to validate the design as a whole, not just for one page. I'm afraid the code will get messy with so many conditionals.