openCL works on MAC. Added colored Kernel code. MAC crashes on kernel running on dev machine.
mac edits work on windows. added key words to highlight in editor. saving new CL files adds them to the list.
OSX Fixes

 * Added a context check
 * Fixed a cmake bug
 * UI fixes for MProp, convert, and volume right-click
Merge branch 'yong_experimental' of github.com:SCIInstitute/fluorender into yong_experimental