Fix calling bundler under Windows.
Fix calling bundler under Windows.

bbatsov/volt,merongivian/volt,voltrb/volt,jfahrer/volt,voltrb/volt,ahnbizcad/volt,nightweb/volt,merongivian/volt,ahnbizcad/volt,matthew342/volt,sinventor/volt,ASnow/volt,mzdunek93/volt,dennym/volt,jfahrer/volt,jfahrer/volt,sinventor/volt,bbatsov/volt,bglusman/volt,gabrielrios/volt,alexandred/volt,RickCarlino/volt,orbitalimpact/crystal-meth,nightweb/volt,matthew342/volt,RickCarlino/volt,gabrielrios/volt,Gaelan/volt,gabrielrios/volt,sinventor/volt,alexandred/volt,alexandred/volt,ASnow/volt,askl56/volt,dummey/volt,ASnow/volt,thyagobr/volt,askl56/volt,bglusman/volt,CollaboTree/volt,CollaboTree/volt,mzdunek93/volt,Gaelan/volt,dennym/volt,RickCarlino/volt,orbitalimpact/crystal-meth,CollaboTree/volt,nightweb/volt,merongivian/volt,bbatsov/volt,dummey/volt,orbitalimpact/crystal-meth,matthew342/volt,mzdunek93/volt,voltrb/volt,bglusman/volt,ahnbizcad/volt,dummey/volt,askl56/volt,thyagobr/volt,Gaelan/volt,thyagobr/volt