don't render page-viewer twice; last_post should actually get the last post posted, not the first one

phasing out app.user() for app.currentUser

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

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

ms iz rendering nothing for hcard and webfinger if account is closed, not showing aspect dropdown if the user account is closed

What i did was to redirect to the tag without dots, in this case cubbies
I didn't consider a good idea to add route support for /tags/cubbi.es
since it get messed with request formats

This reverts commit a407f124.

This reverts commit 2777f16f, reversing
changes made to 8b278adf.

Fix infinite scroll on search... some kind of weird thing with rails responding with json even when request.format is html, with a mime type of html