check CARGO_HOME environment variable when looking for Cargo root dir
check CARGO_HOME environment variable when looking for Cargo root dir

sliz1/racer,rranelli/racer,phildawes/racer,ifraixedes/racer,asantopietro/racer,kbknapp/racer,kbknapp/racer,ajroetker/racer,syhkiller/racer,bluss/racer,sthapaun/racer,jaxx/racer,ifraixedes/racer,drewet/racer,racer-rust/racer,sthapaun/racer,MattWis/racer,syohex/racer,Wilfred/racer,ajroetker/racer,birkenfeld/racer,ane/racer,bluss/racer,drewet/racer,dleslie/racer,ane/racer,syhkiller/racer,BonsaiDen/racer,BonsaiDen/racer,pmarcelll/racer,rranelli/racer,MattWis/racer,alkama/racer,asantopietro/racer,syohex/racer,hotpxl/racer