move to menpo==0.4.0a3 as dependency 

preparing for alpha release 

initial transfer from menpo. This simply moves the following packages from menpo to menpofit: - benchmark - fit - fitmultilevel It does not move other obvious candidates to menpofit, namely: - ModelDrivenTransfrom and subclasses - Differentiable interfaces It also does not remap the imports sensibly for the new top level namespace.