R1:d7fc2296913f

Projects: Filter out archived projects from all project view

Summary: Adds an "allactive" filter in addition to the all projects filter.

Test Plan:
visit All Active view (/project/filter/allactive/) and
see that it lists all projects except those which have been archived.
Visit other filter views to be sure nothing else got broken.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, epriestley

Differential Revision: https://secure.phabricator.com/D2010