matplotlib Code

More progress on programmatic snapping. Applied to markers (to prevent them from disappearing), and legend boxes.

Add snap parameter to gc object and pass it all the way to Agg.

added mdehoon's native macosx patch

Fix tick alignment in colorbars.

suppress gcc-4.3 warnings

Remove one-pixel offset in clipbox code.

Fix disappearing small markers problem.

raise on out of range text location in backend agg

reverted a bug I introduced when toying around with copy region in agg

added some helper functions for poly collections and masked regions