matplotlib Code

removed pre py2.4 compatability code and some other dead code

Improved speed of revcmap -- a startup time offender.

Wrapped long lines in _cm.py; new import syntax

added binary colormap and barcode demo

added tims spectral patch

Fixed line wrap in gist colormaps.

Added gist colormaps.

Added another colorbrewer colormap, RdYlBu.

added reversed colormaps (with _r appended to name)

Multiple changes in support of colormaps from a list of colors,
and masked array input to imshow.