def start_session(user, collection)
      connect
      session = Session.new user, collection
      self << session
      session
    end
def start_session(user, collection)
      connect
      session = Session.new user, collection
      self << session
      session
    end
Createas a new Session for +user+ (String, an existing
 Specify::Model::User#name) in +collection+ (String, an existing
 Specify::Model::Collection#name) and adds it to the #sessions pool.

 Returns the new Session.