added banners for location with color

@ltw. Here's a screenshot of our progress with Pairing is Caring. http://i.imgur.com/ZYABghQ.png?1

We implemented background colors and "enbiggenated" the font for mentor availability locations. Now hopefully people won't schedule sessions for cities they don't live in. Yaaaaay.
I'd prefer padding around each text and have the boxes be variable width (yet another visual distinction from each other).