[WIP] port profile page to backbone.js

this will port the javascript on profile pages
`/people/[guid]` and
`/u/[username]`
to use a backbone view.

Not finished, will create a backbone model in order to handle rendering more gracefully,
also, the persons stream doesn't show at this stage.
grep points to https://github.com/diaspora/diaspora/blob/develop/app/helpers/aspect_global_helper.rb#L43