add Rotation.from_2d_angle, Image.rotate_about_centre
visualize image on MaskedImage reports Mask proportion
path is now preserved on image warping
Merge pull request #509 from jabooth/pathpreserve

path is now preserved on image warping
Merge pull request #508 from jabooth/maskediamgeprop

visualize image on MaskedImage reports Mask proportion
all menpo io glob operations are now always sorted
Merge pull request #510 from jabooth/sortedorderimports

all menpo io glob operations are now always sorted
Merge remote-tracking branch 'upstream/master' into rotate
tidy signatures, added documentation
Merge pull request #511 from jabooth/rotate

2D Rotation convenience constructor, Image.rotate_ccw_about_centre
Remove the use of triplot

Use the the PointGraph viewer instead of triplot because triplot
has some weird behaviour where it resizes the image and looks
terrible.
Show the path in the image widgets
Fix how images are converted to PIL

Can now support float32, float64, bool and uint8 images. uint8
images are untouched, the rest are converted and scaled by 255.

Floating point images outside of the range of [0, 1] throw an
exception now
Stop printing so many 's's!

Thanks @trigeorgis!
convert dgemm calls to np.dot
small tidying to PCAModel constructor
Merge pull request #515 from patricksnape/path_widget

Show the path in the image widgets
Merge pull request #516 from patricksnape/as_pil

Fix how images are converted to PIL
Merge pull request #514 from patricksnape/trimesh_view_fix

Remove the use of triplot
fix bad dgemm to project conversion