matplotlib Code

added cxx and rewrote agg - fixed leak

added stem plot

fixed ps scaling and centering bug

Minor formatting changes.

Changed version to __version__ and read it from __init__.py.

Modification to create the htdocs/license.html.template file depending on the filename argument.

Added a line to the htmldocs section to create the license.html.template file with the appropriate version number.

added a ganged plot example

sync to 0.53.1

Added libz to the agg_flags after having problems importing _image on
Solaris due to unresolved symbols in libz.