Add basic model comparison

[stimpy77]

Add basic model comparing for calculated dirty state

Scenario: A model--just some object--is fetched from the server and the object is associated with a view. User makes changes to a view and dirty on the view says the view changed. But the user changes the data back to the original state. Compare the objects, return a boolean, true if contents of the object same.

Stupid simple utility function.

This is not performant for immediate realtime feedback but would be useful at the time of form post or on timeout after last change.