ENH docstring is now PEP8
FIX small fixes in numpydoc's titles

Numpydoc does not accept the following titles
  - Note (should be Notes)
  - Example (should be Examples)
Merge pull request #2201 from NelleV/MEP10_fixes

FIX small fixes in numpydoc's titles
Merge pull request #2200 from NelleV/PEP8_docstring

ENH docstring is now PEP8
DOC acorr is now in numpydoc format
DOC nitpicks on the acorr methods
Merge pull request #2204 from NelleV/MEP10_acorr

MEP10 acorr methods
Try importing PySide, if we can't find sip.

If no QT_API is specified, we use the value in rcParams and the
default value for this is PyQt.  If a user has PySide installed,
trying to use the qt backend fails, unless QT_API is specified or the
config file is modified.  This commit, adds code to try and import
PySide, if an import of PyQt fails.
[DOC] Add documentation for the QT_API environment variable.
Merge pull request #2142 from punchagan/fix-qt-import

Try importing PySide, if we can't find sip.
DOC annotate is now in numpydoc format
DOC fix typo in the annotate method
Add namespace package mpl_toolkits to package meta-data
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.
Typo
Merge pull request #2220 from felipeacsi/master

Fixing typo in docs
MEP10 axhline and axvline are now in numpydoc format