matplotlib Code

Fix reST formatting.

Remove examples as a stage in make.py, since it is now integrated into the build as an event-triggered plugin.

Fix bug in setting of negative contour linestyles.

Fault tolerant handling of linestyles when too many

Add more hatch styles. Improve consistency across backends.

added marginal density option to hexbin

update release number

update version number

add fulldisk aeqd example.

Create a PdfFile wrapper named PdfPages to act as the target of savefig
to avoid saving figures in png format onto the file-like PdfPages object.