Changes to actions on nearest views

Two changes to the NearestFragment (so both list and map):

1. Action bar buttons to toggle list/map (replacing the lower-right-corner button) and to refresh (not functional yet). I think it looks good, though I worry that the map button is less obvious now.

2. A row of toggle buttons for the various transport types. Entirely non-functional.

Screenshots:

![device-2014-02-26-220233](https://f.cloud.github.com/assets/227091/2275585/834051ba-9f29-11e3-92ee-1507b0d8138c.png)
![device-2014-02-26-220253](https://f.cloud.github.com/assets/227091/2275584/833fbca0-9f29-11e3-86d3-75932b34c466.png)