updated json-forms
fixed Uncaught TypeError bug in user management

Was getting `Uncaught TypeError: Cannot read property 'length' of
undefined` inside of `unmap_user_type` since it is expecting an object.
In some odd cases (my couchdb version atm) the
/_users/_all_docs?include_docs=true view is broken so you get a list of
empty objects instead of user docs.  Improves error handling a tiny bit,
not sure at the moment what the right thing to do is, we should probably
just skip empty user objects.
minor style tweaks to session/user dropdown menu.

List User Management first and align text right. Also show User Mgmt if
user is any type of admin.
0.3.0-beta.27