Fix path clipping
PEP8
Merge remote-tracking branch 'pipping/master'

Conflicts:
	examples/api/scatter_piecharts.py

White space induced conflicts

Conflicts:
	examples/api/scatter_piecharts.py
adding legend handler for PolyCollection
adding labels to stackplot
removing comments and unnecessary line changes
added test image and entry in whats_new
moved stackplot change in 1.5 section of whats_new