Add a menu to NearestFragment, with map and refresh buttons.

These buttons will be shown in the top ActionBar of the MainActivity,
but only while the "Nearest" tab is selected.

Icons from the Android ActionBar Icon Pack.
Toggle between list/map using the menu option instead of button
Add transport type filter buttons to NearestFragment
Merge branch 'master' into nearest-actions

Conflicts:
	res/values/strings.xml
Merge pull request #20 from coyotebush/nearest-actions

Changes to actions on nearest views