Add design assets and style home view.

Adds clickable button to text edit field to start search.

Also modified manifest to allow user to move app to SD card.
Style tab bar.

Used the [Android Action Bar Style Generator](http://jgilfelt.github.com/android-actionbarstylegenerator/), with modifications for customized text.
Bold text of selected tab only
Add styling for home, ballot, and contest views
Extract styles
Styling home view
Fixes for smaller screens
Leave all tabs bolded
Merge pull request #30 from flibbertigibbet/feature/add-styling-home

Feature/add styling home