Styling

Addresses: https://bugs.launchpad.net/oq-platform/+bug/1227155

NOTE: This is a rough first attempt at styling. Some things will needs to be tweaked further.

Also, something broke in the linkage of js libs, so I need to resolve that before. When accessing the ExtJS-based apps, I get errors like this:

<pre>
esource interpreted as Font but transferred with MIME type application/x-font-woff: "http://localhost:8000/static/geonode/font/fontawesome-webfont.woff?v=3.2.1". localhost/:23
Resource interpreted as Font but transferred with MIME type application/x-font-woff: "http://localhost:8000/static/geonode/font/fontawesome-webfont.woff". localhost/:23
GET http://localhost:8000/static/img/glyphicons-halflings.png 404 (NOT FOUND) localhost:8000/isc_viewer/:117
Uncaught TypeError: Cannot call method 'removeClass' of null 
</pre>