Fix building Python integers from size_t values

Use the `n` format specifier instead of `l` to build Python integer or long integer objects from size_t values.
pyplot.gci: Look first in current axes, not most recently added axes.

This fixes a bug in which the behavior of gci did not match its
docstring, as pointed out by Julien Cornebise.
Merge pull request #1944 from mdboom/cancel-zoom

ValueError exception in drag_zoom (tk backend)
Update distribute_setup.py to 0.6.44
BUG: Fix ValueError: setting an array element with a sequence

This is fixed in the master branch
Update stackplot docs for legend capabilities

The docs now state that creation of a proxy artist is the preferred method for
creating legends on stackplots.  This is because stackplot creates
PolyCollection objects which are not supported by the legend
Merge pull request #2119 from efiring/fix_gci

pyplot.gci: Look first in current axes, not most recently added axes.
Merge pull request #2144 from cgohlke/patch-3

BUG: Fix ValueError: setting an array element with a sequence
Merge pull request #2149 from tacaswell/volume_overlay_fix

added `add_collection` call to `finance.volume_overlay`
Merge remote-tracking branch 'upstream/v1.2.x' into v1.3.x
Merge pull request #2130 from mdboom/distribute-to-setuptools2

Update distribute_setup.py to 0.6.44
Added missing '#'; when starting ipython, I was getting the following message:
Bad key "text.hinting_factor" on line 184 in
/home/marianne/.matplotlib/matplotlibrc.
You probably need to get an updated matplotlibrc file from
http://matplotlib.sf.net/_static/matplotlibrc or from the matplotlib source
distribution
Merge pull request #2180 from pelson/v1.2.x

Backported #2178 to v1.2.x
Merge remote-tracking branch 'upstream/v1.2.x' into v1.3.x
Add warning for mixing AnchoredText with bad kwarg

Mixing 'ha' or 'va' with AnchoredText produces bad output, so add a warning in
this case.
Merge pull request #2146 from dmcdougall/fix_stackplot_legend

Update stackplot docs for legend capabilities
Merge pull request #2166 from dmcdougall/warn_anchortext

[SPRINT] Add warning for mixing AnchoredText with bad kwarg
Create the doc/mpl_examples symlink if not existing.
Fix the link to the nosedocs and add a little more information
Clear the Python exception when the transformation passed in does not parse as an affine transform.