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
Change anchored_artists.AnchoredSizeBar: docstring, vertical size, color

- Add size_vertical variable, which sets the height of the size bar.
- Add color argument, which change the color of rectangle bar (not the
  label, need to figure out how to do that).
- Docstring: listing the possible arguments and adding an example.
Change anchored_artists.AnchoredSizeBar: put label over rectangle

Add variable label_top to change the position of the label from below
the rectangle to over the rectangle
Sprint: Added new external resources page, link from main and content pages
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.
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