MUMUP-1190: Polish up the UI for the switchers

Just some small tweaks and vertical centering, and larger buttons for mobile (while not breaking for iphone).

![image](https://cloud.githubusercontent.com/assets/1919535/4564653/548753c8-4f19-11e4-9879-e0f4e728158b.png)

![image](https://cloud.githubusercontent.com/assets/1919535/4564657/60616b0c-4f19-11e4-9952-3cccde9f5c1a.png)