Include gps/location icons in the project

These were mistakenly dropped in the transition from the v1 skin to the
v2 skin.
Use default search bar and move GPS button

In iOS 7 our trick to add a button to the search bar did not not look
great. I deleted the search bar, dropped in a default one, and added a
new button to the bottom right of the map view that triggers the
location finding.
Fix up species search bar

The alphabetical index strip on the right side of a table view does not
play nice with a UISearchBar. This is a known issue with no great
workarounds. I updated the background colors and width of the
UISearchView so that it looks as good as possible.