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
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
Fix missed search-and-replace
Merge pull request #2195 from mdboom/docs-and-licensing

Update copyright model for matplotlib as of v1.3.0
Merge pull request #2210 from efiring/namespace

Add namespace package mpl_toolkits to package meta-data