Refactor Org admin to table based view

The implemented UI was unusual and did not match the other admin
pages.  I refactored to render as a table with row actions and tried
to re-use most of the code that was existing.
Clean up invalid HTML

Presumably some previous refactor left a handful of unclosed tags
and orphaned <li> elements.  I restored the order.
De-linting

Bad markup and missing semi-colons
Add the login controls to the new admin pages
Merge pull request #53 from azavea/topic/org-redo

Refactor the Organization admin page