Reimplemented the shortlink feature.

- Editing shortlinks in the admin interface updates the Edit_Imports table,
  so that new global data is fetched by clients
- Shortlinks now use the new link format.
  They are parsed as anything starting from the #,
  so it is ok to add complete URLs to any host, but it also works if its just "#$foo".
- I found a nice way of circumventing the Router/History changing the URL from the shortlink to it's target,
  by using Backbone.history.loadUrl.
- fixes #8
- closes #12