Candidate ui#31

### Be careful, this has some hard UI change.
  - Remove icon from county list because it's clear without icon to put aside.

> Warning: 98fbdb420aefc34e618779ec8efd7b69a1f0be22 g0v.css will be revert 

  - Replace page-header to hero-unit which has image to be its background.

  - Two icon is add into repo.

> Notice: You can logo.png to cloud, logo2.png is just backup if you don't use it.


Images: 
Before
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![2014 4](https://cloud.githubusercontent.com/assets/3825000/5187433/14ff56a0-7508-11e4-88f9-0bd01ba9ef66.png)
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![2014 3](https://cloud.githubusercontent.com/assets/3825000/5187432/14dbbcc2-7508-11e4-94c7-c2fa08f2de9a.png)
After