Made travis builds use PATH from travis build environment.
Made travis builds use PATH from travis build environment.

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