Ignore Ruby Sass's cache.

Lamesauce.
Move bower components out of public directory.

We’ll specifically copy any assets we need to be directly accessible by
end-users.
Add font and image assets.
Update grunt tasks to copy fonts, and copy images on initial build.
Switch to Ruby Sass for Susy. :poo:
Initial front-end design pass.
Override title on content pages.
Add highlighted active class helper for main navigation.
Create actions content region.
Updated README Homstead requirements.
Merge pull request #52 from DoSomething/frontend

Initial front-end pass.