Provide ordering options in Diffusion application search

Summary: Fixes T2298. Allows repositories to be ordered by name, callsign, commit, or date created. Slightly messy because of cursor paging.

Test Plan: Sorted commits.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T2298

Differential Revision: https://secure.phabricator.com/D6919
Restore repository shortcuts, for now

Summary:
These need to die soon since they're not structurally policy-aware, but keep them around for the moment until we can replace them.

There is no UI to create these, and only Facebook has them.

Test Plan: {F57614}

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D6920
Clean up Diffusion repository list

Summary: Simplify rendering of the repository list. For inactive repositories, mark them disabled.

Test Plan: {F57615}

Reviewers: btrahan, rockybean

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D6921