FIX issue #72: Error when using GHERKIN_COLORS environment variable.
FIX issue #72: Error when using GHERKIN_COLORS environment variable.

Gimpneek/behave,Gimpneek/behave,spacediver/behave,charleswhchan/behave,tokunbo/behave-parallel,jenisys/behave,metaperl/behave,tokunbo/behave-parallel,Abdoctor/behave,kymbert/behave,vrutkovs/behave,hugeinc/behave-parallel,vrutkovs/behave,benthomasson/behave,mzcity123/behave,connorsml/behave,Gimpneek/behave,benthomasson/behave,mzcity123/behave,kymbert/behave,jenisys/behave,KevinOrtman/behave,joshal/behave,Abdoctor/behave,KevinOrtman/behave,joshal/behave,connorsml/behave,allanlewis/behave,allanlewis/behave,spacediver/behave,charleswhchan/behave,metaperl/behave,KevinMarkVI/behave-parallel