adds displacements method
method only defined in FittingResult of fit
Merge remote-tracking branch 'upstream/master' into displacements
adds dispacements_stats
Merge branch 'displacements' of https://github.com/nontas/menpo into displacements
Merge pull request #447 from nontas/displacements

Displacements in fitting result
Merge remote-tracking branch 'upstream/master' into python3