commit. Add migration and rake task to copy hidden information from
share_visibilities to users. see: http://devblog.joindiaspora.com/?p=44

fix #2627 (webfinger produces 500 error, and refactor a little to encapsulate into Webfinger object a bit more

remove ajax_stream? logic from streams now that we're using backbone & never ajaxing on mobile; remove unreferenced community_spotlight stream & controller

This reverts commit c61e84bc, reversing
changes made to b88899ff.

modified app to return a hash if current_user is not present; removed view specs in postsController specs & moved logic to js/jasmine

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

added api response for likes; cleaned up view logic; specify like collection url from parent model (Post)

migrating like actions over to backbone; some cleanup; bump jquery to
1.7.1

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