+ make some tests a little nicer

closes #3106 - hardening url handling,
fixes #2725 - backport from upstream

some cukes may be failing non deterministically, I think, do we bump the cuke timeout?

The punycode.js file was somehow removed from the repo. This
replaces it with the current version from github and adds it
to our main.js manifest. Our javascript requires punycode for
(at least) stream rendering.

* Move all Diaspora-specific javascripts to app/assets/javascripts
* Move all vendored javascripts to vendor/assets/javascripts
* Add the appropriate Sprockets require directives to make sure
  everything gets included in the right order
* Remove Jammit dependencies
* Fix all templates that were using Jammit's include_javascripts helper
* Add handlebars_assets gem for compiling Handlebars templates
* Move all Handlebars templates to app/assets/templates and rename
  from .handlebars to .jst.hbs (this is to keep them in the same
  global JST namespace that they were in under Jammit)
* Add public/assets to .gitignore since these files can and should
  be re-generated by Heroku or Capistrano during each deploy
* Fix a few Handlebars templates that were looking for images in the
  wrong location (I'm sure there are others, but it's late)
* Configure application.rb to precompile all javascript and css assets
  that were compiled by Jammit in the Rails 3.0 code

everything ported from pre-mysql mobile stuff.  things missing: search page, aspect switcher, notification badge.