BUGFIX:  This change fixes #2475, where contour labels added manually
produce ugly spikes in the contours.  The problem was that screen
coordinates were being passed as data coordinates when the contour was
split to add room for the label.

Incorporate my fix and miili's #2806 change
TST : added test to exercise transform kwarg to `add_label_near`

This exercises with input in both display and data units.
BUG : fix fetch of freetype version during build

Use freetype-config --ftversion flag to get freetype version (previously
using freetype-config --version which returns libtool version).
DOC : added whats_new entry for Qt5 backend
DOC : fixed grammer
BUG : raise exception in subplot if num out of range

if subplot(rows, cols, num) is called with num not in
0 < num <= rows * cols raise a ValueError

close #3166
Properly deprecate num=0 in subplot related functions
Added 'PyQt4v2' to valid values for backend.qt4

Matching to what is allowed by the code in qt4_compat.py

Closes #2977
DOC : improved add_label_near

 - added some in-line comments to explain what is going on
DOC : cleaned up/clarified docstring
Make type1font.py work better on Python 3.x

Communicate token types as objects instead of strings from the
tokenizer to the parser. Use proper Unicode strings for string-like
data in the font properties. Fix the handling of delimiters.

Resolves #3049.
Merge pull request #2843 from tacaswell/contour_fix

BUGFIX:  This change fixes #2475, where contour labels added manually
Merge remote-tracking branch 'refs/remotes/upstream/v1.3.x'

Conflicts due to tests being added by both branches

Conflicts:
	lib/matplotlib/tests/test_contour.py
DOC : grammar/history fixes
Merge pull request #3156 from tacaswell/qt5_whatsnew

DOC : added whats_new entry for Qt5 backend
Add missing import of unichr from six.

Unichr is not defined in python3. This matches the usage in mathtext
Merge pull request #3208 from jenshnielsen/unichr_python3

Add missing import of unichr from six.
Merge pull request #3167 from tacaswell/subplot_index_fix

BUG : raise exception in subplot if num out of range
Merge pull request #3121 from tacaswell/qt4_validation

Added 'PyQt4v2' to valid values for backend.qt4
Credit Thomas A. Caswell.