Feature/add styling home

This adds styling for the home, ballot, and contest views, and for the tab bar.

Styling for the tab bar was built using the Used the [Android Action Bar Style Generator](http://jgilfelt.github.com/android-actionbarstylegenerator/), then modified for custom text.

The home view background asset hasn't been added yet; otherwise, the home view styling should be complete.  Home view now has an added search image button within the text edit box.