Add user admin project filtering
Add user admin project filtering

Adds three filters to user projects: project with active versions, project with
built versions, and project with recent builds (in the last year)

davidfischer/readthedocs.org,davidfischer/readthedocs.org,safwanrahman/readthedocs.org,pombredanne/readthedocs.org,safwanrahman/readthedocs.org,rtfd/readthedocs.org,tddv/readthedocs.org,davidfischer/readthedocs.org,tddv/readthedocs.org,rtfd/readthedocs.org,tddv/readthedocs.org,safwanrahman/readthedocs.org,pombredanne/readthedocs.org,davidfischer/readthedocs.org,rtfd/readthedocs.org,pombredanne/readthedocs.org,rtfd/readthedocs.org,safwanrahman/readthedocs.org