Include instance name in confirmation email

Add the slug name to the text of the email as well as including it in
the confirmation URL.

Fixes #455
Fix new instance creation

It seems that the /instances/:name routes is also used when a new
instance is created but hasn't yet been confirmed. So check the instance
status before redirecting.
Merge branch 'master' into 468-person-page-overhaul
Merge remote-tracking branch 'mysoc/488-organization-page-overhaul' into chris-dev

Conflicts:
	public/js/instance-admin/actions/person-new.js