StencilView docstring revision
Merge pull request #2594 from kivy/docstring_revision

StencilView docstring revision
make doc autobuild.py work under python 3
widget doc fix
Merge pull request #2597 from kivy/doc_rev

Widget doc fix
Merge pull request #2595 from LauritzThaulow/master

Fix formatting error in kv lang docs
Fix typo in graphics guide docs