matplotlib Code

Add support for Latex2e-style math fonts (\mathrm, \mathit etc.)
Add support for function name shortcuts (\sin, \cos etc.)
Raise an exception when encountering double subscript or superscripts
(e.g. x_i_j)

bugfix segfault in transforms module. Thanks Ben North for the patch

Changed what appeared to be a typo where x-axis values were being converted using the y-axis unit converters.

cleanup some code in ScalerFormatter, use unicode multiplication sign in
offset ticklabel

Fix running unicode_demo.py from backend_driver.py. (The -*- coding
line must appear before any non-comment lines).

don't require setuptools by default.

Deal with font tags (\cal \it \rm etc.) more like TeX

Minor cleanup and simplifications. Handle sub/superscript as a unary operator.

Got nested sub/superscripts working. Improved formatting of grammar
to be more readable to newbies (like me).

fixed a formatting bug in ticker.ScalarFormatter (10^0 was rendered as
10 in some cases)