Added switch to turn off auto-shading in scatter3D referenced in issue# 1692, added new baseline image tests to include shaded/non-shaded scatter plots
Added README
Renamed autoshade_off to autoshade for clarity
Minor tweak
Removed README
Merge pull request #1 from CSCD01/Scatter3D-AutoShadin-#1692

Scatter3 d auto shadin #1692