Implements feature status delete

Fixes issue #4

See merge request !6

Fixes issue #2

See merge request !7

Fixes issue #4

Breaks the specs.

We need to get users into the store, though.

This fixes #11.

Much smaller filesize for vendor.js, although we'll have to see if all
the intervals are ok.

This might happen when you visit other convos via the notifications bar.

I still have to think about how to integrate them in the state system...