Merge branch 'master' into jingxian2
Merge branch 'master' into jingxian2
Parametric function example
Parametric function example 2

Changed the x,y axis positions to the center.
Merge branch 'master' into jingxian2
"Save As…" button text and title changed
Merge branch 'master' into jingxian2
Question mark and explanation for Root and Share

The question mark and meaning to Root and Share checkbox have been
added.
Question mark and explanation for Root and Share

Marked the first question mark with Root. May need variables for
description strings.
Question mark for URL

Added question mark and description to URL in author mode.
Merge branch 'master' into jingxian2

Conflicts:
www/index.html
Merge master into jingxian2
Merge branch 'master' into jingxian2
Update jingxian2
Removed Redundancy in lessons learned

changed lessons learned display into a function instead of being copied
in two places
Moved lessons learned to new file

Created lessons-learned.js because there was no where else to put the
displayLessonLearned
Adding hint slides for ps-05
Kurt's new Ps5-03; bugs from author mode have been hand-fixed.
Resolved conflicts, fixed lessons learned text.
Adding new images for ps5-03