Adds Bitcoin widget

![screenshot](http://cl.ly/image/1m180P043h3o/Screen%20Shot%202014-08-31%20at%204.41.38%20PM.png)

Adds a bitcoin widget. Should show percent change between five minute polling. Wouldn't hold my breath on that.
spaces > tabs
Merge pull request #10 from websages/feature/9-bitcoin-widget

Adds Bitcoin widget