update study group page

Updated study group page with new content and minor style adjustments.
Embedded google calendar in the side bar.

I didn't change db/schema.rb, so I don't know why it is showing here.
I'm not sure how to remove it.

![screen shot 2014-02-17 at 2 28 28 am](https://f.cloud.github.com/assets/3781722/2184366/6c925386-97be-11e3-882f-14e87b2ef812.png)