Only run moonscript tests if moonscript is present
Only run moonscript tests if moonscript is present

This updates the moonscript specs to detect whether or not moonscript is
present, and if not marks all moonscript tests as pending, instead of
attempting to execute them.

sobrinho/busted,DorianGray/busted,mpeterv/busted,ryanplusplus/busted,xyliuke/busted,istr/busted,o-lim/busted,Olivine-Labs/busted