Websocket API needs support for last seen, number of nodes in use, and user type

[Lilyana Videnova]

From User:

last_login ("last seen" column)
user_item.node_set.count ("machines" column, used to be "number of nodes in use")

From UserProfile:

is_local ("type" column)

I don't think there should be any issues on the angular client with adding additional fields to the existing user object as there's no particular schema on the client. It would be ideal if the user object could grow these new properties, rather than having a separate object/rpc method. We should probably have a chat about sensible client/api versioning at some point though.