start giving a more 'Ember-like' appearance

Pull styles from emberjs.com to update the following:
  header and footer background color
  page background color
  font types & colors

Here is a screenshot preview:
![overview___ember_app_kit](https://f.cloud.github.com/assets/514063/1178053/0ecc8a1c-219b-11e3-9773-38bbd3d7f2fe.png)

I'm not a designer and the pages could use more work, but I figured I would take a quick pass and try to integrate the emberjs.com grey/orange