spines: simplify code
mplot3d: fix axes juggle issue, fix ticks on end of axes range
Don't limit notch size in boxplot to q1-q3 range
bugfix: mlab.prctile handles even-length data
tests: add unit test for prctile
draw_image api to use an arbitrary affine transform
support unsampled image for ps backend
Add patch_artist kwarg to boxplot
fix wrong tick direction at the boudary of floating axes
Fix AttributeError in figure.draw when compositing images
