Update MANIFEST.in
Update MANIFEST.in

Remove pointless includes already specified in setup.py
Add LICENSE.txt and AUTHORS.txt

patricksnape/menpo,patricksnape/menpo,menpo/menpo,grigorisg9gr/menpo,grigorisg9gr/menpo,yuxiang-zhou/menpo,menpo/menpo,patricksnape/menpo,yuxiang-zhou/menpo,yuxiang-zhou/menpo,grigorisg9gr/menpo,menpo/menpo