[fix bug 943647] Add graceful degradation for IE7 on spaces contact page...

Mapbox does not support IE7 ([more info](https://www.mapbox.com/blog/internet-explorer-seven/)), so this PR aims to add some graceful degradation for that browser:

* Adds an IE7 specific CSS stylesheet to fix up some layout issues
* Adds an IE7 JS file, as there is no need to load mapbox.js or the spaces & community data. This new file simply show's the right menu's on load, ensuring the pages are navigable.

This allows IE7 users to browse all the contact/spaces/community information, as well as still see the static maps.