matplotlib Code

Improved boilerplate.py so that it generates the correct signatures for pyplot functions.

added sf patch 2786759 for fill_betweenx

added marginal density option to hexbin

moved fill_between to axes/pyplot method

Fix some python2.6 -3 warnings. (mainly usage of has_key)

Added Barbs polygon collection (similar to Quiver) for plotting wind barbs. Added corresponding helpers to Axes and pyplot as well. (examples/pylab_examples/barb_demo.py shows it off.)

continue conversion of docstrings to restructured text

Add hexbin to one more place in boilerplate.py

Added hexbin axes method and pyplot function by Michiel de Hoon.
Tracker 1952339.

fixed an aspect=auto problem with bezier ellipse approx