added banners for location with color

@ltw. Here's a screenshot of our progress with Pairing is Caring. http://i.imgur.com/QRTr51a.png

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.
You're going to want to ensure that *something* is set as a background-color. If I set the location to Columbus, this code will generate `style="background-color:"`