Internet Explorer fixes

Todo:

* [x] Organisation types dont display correctly (IE7+8)
* [x] Geo spatial search boundaries don't work properly (IE7+8)
* [x] No BG on geo spatial map buttons (IE7+8)
* [x] Header displays slightly too much padding bottom (IE7)
* [x] Breadcrumb background image has grey bg (IE7)
* [x] Metrics dropdown behaves oddly (IE7)