Added SceneCanvas.draw_visual
wip: fixing visual examples
Most visual examples working.
flakify
Removed event=None default args
docstring update
updating visual tests
Fixed visual image comparison tests
Added test3 makefile target
text_visual example corrections
Fix httplib import for py3
Py3 corrections for image comparison tests
cleanup
Close socket after uploading test results
Easier upload url selection
Fixed polygon examples
Fixed more examples
fix backend selection log message
flakify
Skip polygon tests on py3