matplotlib Code

Prevent the mathtext cache from getting out of hand, by clearing it
after every plot.

Fix capitalization of "Pdf", which must match that in matplotlib/__init__.py

fix verbose reporting with traited config

Change mathtext.* rcParams so they accept a string which is a set of
arguments to the FontProperties constructor. This has been added to
both the classic and traits based configuration frameworks.

sync tconfig.py with sources in ipython1

Take a version check out of the method call. Thanks to Fernando Perez.

Remove a Unicode character

Added coll.update(kwargs) to hline method; thanks to Daniel Fish

revert changes that cause embedding_in_qt4 to fail

fic bug in traited config: mathtext settings