added the HSL color adapter
Merge branch 'category_manager' of github.com:cs3733-team4/wpi-suite into category_manager
added the color picker, but it's not nearly finalized, probably will change after meeting today. there is also a quick fix for the button header that was broken in this branch that will most likely conflict with the bug_fixes branch change, so use that one instead when a merge occurs. Also I was getting an error in VanGoghPainting that I will bring up at the meeting. there is also a work-around for that error in this commit