Location component

Added photo field to venue for banner view of location in the background.
![screenshot from 2014-06-02 20 59 00](https://cloud.githubusercontent.com/assets/3149236/3149355/b21af2ce-ea6a-11e3-9196-6b9072a46bf4.png)

It would be better to maintain compatibility with the expected bootstrap layout.  Conforming to bootstrap conventions will make it easier for osem operators the theme the site to their aesthetic expectations.