mplot3d: add bar3d, improve z-sort, hist3d example
Add merge tracking to the mathtex branch.
Creating a branch for mathtex integration.
initial submission of the annotation guide.
axes_grid : minor improvements in anchored_artists and inset_locator.
Fix mplot3d bug with empty lists thanks to Ryan Wagner.
Fix a few bugs in ConnectionStyle classes. Add ConnectionPatch.
use png icon on gtk for win32
centered ticklabel examples
Yet another iteration on the version checking in backend_wx
