Created unit list view in organisation app.

Added description to person and linked to unit.
Style the units list page.

Add Font Awesome for icons.
Use UnitMembership instead of link between person and unit.
Add tests for units in the organisation apps.

Had to move and change the test url mechanism to a foundation-wide test url list
(override_settings decorator seems to only work with one app at a time).
Make test search for the first occurance instead of last

Main content should come before sidebars
Add sidebar with a short list of people in units
Add order to units so some units can be manually ordered instead of alphabetically
Update tests in organisation

Include test for manual order of units
Merge pull request #46 from okfn/unit-list

Unit list