Allow linking to a circle directly

[azul]

We based our collectives app on circles and it would be great if we could directly link to the circle that matches the collective rather than just link to the circles app.

For now I imagine using the fragment part of the url for the unique circle id or the name of the circle:

/apps/circles/#myCircle
or
/apps/circles/#e33e72be640e02

A bit of js in the circles app should be enough to select the corresponding circle and show it. Maybe the url could be updated accordingly when picking a circle as well. This would enable copying the link and using it in other places such as emails.

I don't think history support is required here.