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.
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
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
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.
Pass an instance, rather than a type, to cleanup_path
Use a regular expression to handle the different output of integers on Unix and Windows.
Updated some of the documentation information.
Updated license initials & copyright notice.

Update license
Merge pull request #2106 from mdboom/identitytransform-bugfix

Matplotlib 1.3.0rc2 test errors on win-amd64-py2.7
Merge pull request #2167 from mrterry/table_zorder

[sprint] forward keyword args though table
Merge pull request #2154 from torcolvin/master

catch fontconfig errors on OS X
Merge pull request #2173 from mdboom/docstring-coding-guidelines

[Sprint] Update coding guidelines wrt documentation
Merge pull request #2171 from mdboom/nose-docs-link-fix

[sprint] website for tests.py usage does not exist
Merge pull request #2108 from cgohlke/patch-2

Fix building Python integers from size_t values