matplotlib Code

mplot3d: update axes code, add support for '3D' text.
Split and add examples and begin documentation.

fix axes_grid/demo_parasite_axes.py

modifications to examples/docs to get them to build for the website

removed reserved name "as" from some examples

update doc strings to point to new fill between demos

update changelog

add support for bz2 files per sf support request 2794556

fixed a doc tutorial url

fix typo in axes_grid/clip_path.py

Tweak John's change to handling of rgba arrays