remove sort order logic from controllers; backbone stream does not support it; was to be depricated anyway

DG DH; made acts_as_api play nice with backbonejs.  comments are semi-functional; stream elements use the StreamElement js widget (for now).

this should fix a weired test polution case on travis where the x-git-revision header is suddenly nil

DH DG; made privacy page; can now unblock a user; users are actually being blockocked in ajaxed streams

Revert "remove sort order option from the stream (commented at is too crazy and way to slow on large data sets)"

This reverts commit 95aac2f3.

remove sort order option from the stream (commented at is too crazy and way to slow on large data sets)

This reverts commit 607013bc.