Removed glsl/constant.frag.
Removed glsl/constant.frag.

This should be in the previous commit, but OS X is case insensitive and somehow I can't squash them together.

GafferHQ/gaffer,andrewkaufman/gaffer,lucienfostier/gaffer,andrewkaufman/gaffer,GafferHQ/gaffer,goddardl/gaffer,lucienfostier/gaffer,ImageEngine/gaffer,ivanimanishi/gaffer,GafferHQ/gaffer,johnhaddon/gaffer,appleseedhq/gaffer,hradec/gaffer,cedriclaunay/gaffer,cedriclaunay/gaffer,lucienfostier/gaffer,goddardl/gaffer,appleseedhq/gaffer,chippey/gaffer,ivanimanishi/gaffer,ImageEngine/gaffer,hradec/gaffer,boberfly/gaffer,boberfly/gaffer,johnhaddon/gaffer,andrewkaufman/gaffer,GafferHQ/gaffer,appleseedhq/gaffer,cedriclaunay/gaffer,hradec/gaffer,lucienfostier/gaffer,davidsminor/gaffer,ivanimanishi/gaffer,cedriclaunay/gaffer,ImageEngine/gaffer,hradec/gaffer,johnhaddon/gaffer,boberfly/gaffer,ImageEngine/gaffer,johnhaddon/gaffer,andrewkaufman/gaffer,davidsminor/gaffer,boberfly/gaffer,andrewkaufman/gaffer,chippey/gaffer,goddardl/gaffer,chippey/gaffer,johnhaddon/gaffer,davidsminor/gaffer,goddardl/gaffer,davidsminor/gaffer,ivanimanishi/gaffer,appleseedhq/gaffer,GafferHQ/gaffer,chippey/gaffer,hradec/gaffer