Merge pull request #2208 from NelleV/MEP10_annotate

DOC annotate is now in numpydoc format
Fixing small typo in the plot tutorial.
Fix for false detection of gtk3
Merge pull request #2215 from josericardo/master

Fixing small typo in the plot tutorial.
Fix support for datetime axes in 2d plots.

Fixes the error raisesd when 2d datetime coordinates are passed to
contour/contourf and the errors when 1d or 2d datetime coordinates
are passed to pcolor/pcolormesh.
Merge pull request #2195 from mdboom/docs-and-licensing

Update copyright model for matplotlib as of v1.3.0
Typo
Merge pull request #2220 from felipeacsi/master

Fixing typo in docs
MEP10 axhline and axvline are now in numpydoc format
DOC modified sphinx's layout.hml

The previous sphinx layout relied on overriding a default template.
It meant we could not easily add links and other things in the header.
The new layout does not inherit from anything, hence makes it easier
to tune.
DOC the space between titles and the rest is now bigger
DOC improved spacing between functions, classes and the rest
Merge pull request #2209 from NelleV/MEP_axhline

MEP10 axhline and axvline are now in numpydoc format
Merge pull request #2186 from NelleV/doc_styling

DOC modified sphinx's layout.hml
Merge pull request #2210 from efiring/namespace

Add namespace package mpl_toolkits to package meta-data
Merge pull request #2210 from efiring/namespace

Add namespace package mpl_toolkits to package meta-data
Merge pull request #2215 from josericardo/master

Fixing small typo in the plot tutorial.
Merge pull request #2217 from AdamHeck/master

Fix false detection of gtk3 bindings during install
Merge pull request #2217 from AdamHeck/master

Fix false detection of gtk3 bindings during install
Improve message about file in old place