matplotlib Code

Fix font caching bug on OSX

Prevent errors when using OpenType CFF fonts. This means turning off
subsetting on backend_pdf, and raising an exception in backend_ps.

First pass at getting STIX fonts to work.
Support .otf fonts in font_manager.py

Removing debugging output in last commit.

Fix font.size from being saved in the fontManager.cache

Fix set_name call.

Better fontconfig pattern standards compliance. Added experimental
(may be removed) fontconfig support.

mathtext.* font rcParams now use fontconfig patterns to specify fonts.
Support converting FontProperties objects to/from fontconfig patterns.

Use pickle to cache entire fontManager instance.
Call font_manager.findfont() instead of font_manager.fontManager.findfont().

Grab list of fonts from fontconfig if fontconfig is installed.