ENH: add HTML Help builder option
Build gallery also for HTML Help docs
Fixed error with QSizePolicy

Changed QtGui.QSizePolicy to QtWidgets.SizePolicy as the namepace has changed from Qt4 to Qt5
Fix #3304.

Fix crash in tostring_rgba_minimized when the region has zero-size.

Thanks to @neothemachine for tracking this down.
Fix exception message
Simplify reference counting
Workaround for Sphinx not escaping ``_`` (underscore) for tex output
Merge pull request #3329 from lennart0901/fix_#3326

Workaround for Sphinx not escaping ``_`` (underscore) for tex output
Merge pull request #3325 from cgohlke/patch-1

ENH: add HTML Help builder option
Merge pull request #3324 from mdboom/backend-agg-crash

BUG : fixes memory corruption issues with zero-size rasterized artists

Fix #3304.
Merge pull request #3324 from mdboom/backend-agg-crash

BUG : fixes memory corruption issues with zero-size rasterized artists

Fix #3304.
Merge branch 'v1.4.x'
Restore compatibility with Python 3.2
Merge pull request #3331 from cgohlke/patch-2

Restore compatibility with Python 3.2
DOC : added folders for api_changes and whats_new

Added README + folders for whats_new and api_changes files.

The idea is instead of everyone editing the same file (which leads to
frequent conflicts requiring either manual merging or re-basing) each
entry will create a new file which will be assembled into a single file
during the release.
BUG : don't assign color to flier props if None

Close #3336
Fix mathmpl images not showing in HTML Help (CHM)
AGG link changed. Also fix other doc warnings
Add lines_api.rst and patches_api.rst
Add text_api.rst