And make use of that in HelpView

Load the default locale and fall back to it on missing key
and interpolation errors

extending loaded js locales.

cleaned up unused routes. removed some comments. loading help locales only on help view.

removed afterRender from backbone views. extended load_javascript_locales method to take a section.

Should make situations like #4468 less frequent

* 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

merged with master, 7 cukes failing. jasmine is green. need to remove rails.js helpers so things suck less