matplotlib Code

Remove the "markup" kwarg and rcParam everywhere and replace it with
an automatic detection of math markup.

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

Make rcParams.update(rcParamsDefault) when new traited config is
switched on.

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.

Improve font manager so default font names like "serif", "sans-serif"
etc. are looked for across all fonts in that mapping, not just a
single hard-coded one.
Add DejaVu fonts as an alternative to Vera fonts if present.
Fix how mathtext non-Computer Modern fonts are specified.

Expose Unicode font functionality for mathtext through rcParams

Removed mathtext2. Fix horizontal centering in mathtext. Put all
mathtext_examples on one plot.

Add kwarg 'markup' for all text that allows the user to choose either
'plain' or 'tex' markup. A default may also be provided in the
rcParam 'text.markup'.
Minor bugfix to mathtext.py

validate rcParams

added configurable option legend.loc