matplotlib Code

Add a few *incomplete* notes about ctypes

Add clip path support on images. Add a new example and update the dolphin fest.

When initializing a shared axes, respect limits already set on master.
This is a tentative first step; more will be required.

Make pyplot.twinx() and twiny() draw after creating the axes

whitespace deletion in cbook.py

update backend_driver for new location of two_scales.py

added ticker api docs

Fix text alignment in PDF backend. (At suggestion of Stan West).

Fix alignment of Unicode strings in PS backend. Thanks, Stan West.

Fix buglet in font_manager.py