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.
Use less aggressive garbage collection. Fixes GH-3044.
BUG : patches.Wedge.set_radius set wrong attribute

set_radius set the attribute `radius` which is not
used to compute the path.  Change to set `self.r` which
is used.
BUG : turned clipping off on pie chart components
 - set default value of `clip_on` in *prop dicts
 - closes #2518
BUG/API : tweaked how AnchoredSizeBar handles font properties

 - removed the explicit `prop` from
    `mpl_toolkits.axes_grid1.anchored_artists.AnchoredSizeBar`
 - pass `fontproperties` through to the base class in place of `prop`
 - if `prop` is not None and `fontproperties` is None, then use
   `prop` in place of `fontproperties`.
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
BLD : fix build on windows

patch suggested by cgohlke to fix issues with building
FreeType extension

Closes #3140
cleaned up rouge merge lines
DOC : documented bottom kwarg of hist

closes #3136
restored default boxplot style and respect for the sym kwarg
fixed typos/formatting in docstrings
clean up whitespace
BUG : fix errors when using fliers

doplot for horizontal boxes (internal bxp helper function) assumes that
it will be passed an even number of positional arguments which it swaps
pair-wise.  The code to draw the fliers also passes in a format string
which breaks the assumption.

 - re-worked how `bxp` deals with the `sym` input
 - minor pep8
MNT : replace and deprecated qt4_compat

As part of the work to support qt5 qt4_compat got renamed to qt_compat.
Replaced the module for graceful deprecation.

Closes #3172
DOC: Fix order of parameters in ax.text docstring.
Merge pull request #3180 from danielballan/fix-text-docstring

DOC: Fix order of parameters in ax.text docstring.
Merge pull request #3163 from tacaswell/hist_doc

DOC : documented bottom kwarg of hist
run autopep8 in examples/api