Support a simplified iframe view that is 100% map.

This is enabled by adding ?simple=true to the iframe URL.

Live Example:
https://syriatracker.crowdmap.com/iframemap/?simple=true

Screenshot attached:
![screen shot 2013-08-09 at 12 22 28 pm](https://f.cloud.github.com/assets/106068/936188/fa631672-00a2-11e3-9865-ccb1d3cd4b66.png)