adds sift function
Merge branch 'sift_features' of https://github.com/nontas/menpo
remove sift
remove cyvlfeat import
Some fixes for PIL image importing

We were not handling PIL images properly, now we do (in terms of
the data type). We can now handle more image types including
alpha channel PNGs. I also added kwarg to allow you to
skip the normalisation of images
fixes visualize_images bug
adds rgb option
adds visualize_atm
Merge pull request #494 from nontas/widgets_fix

Widgets bug fix and Active Template Model widget
Bug fix in graphs
No need for int in n_vertices
Merge pull request #492 from patricksnape/image_io_fixes

Some fixes for PIL image importing