Fix the wierd graph hover bug (finally): Turns out the graph metric ids weren't unique (for eg, 'big-a'), so backbone-relational was overwriting the metric models' attributes when id collisions occured. Solution was to change the server side to assign metrics ids. NOTE: the current way of doing of assigning metric ids (as part of the metadata for graph widgets) is probably going to change once we have gotten rid of the 'client_config' stuff all over the server side of our widgets.