Fixed exclusion of nw.exe on windows
Fixed exclusion of nw.exe on windows

mllrsohn/grunt-nw-builder,gion/grunt-node-webkit-builder,conceptualspace/nw-builder,conceptualspace/grunt-nw-builder,rogerwang/grunt-node-webkit-builder,nwjs/grunt-nw-builder,Fridus/grunt-node-webkit-builder,create-mediadesign/grunt-node-webkit-builder,rbrcurtis/grunt-node-webkit-builder,mwbrooks/grunt-node-webkit-builder,conceptualspace/grunt-nw-builder,AaronO/grunt-node-webkit-builder,abods/grunt-nw-builder,mllrsohn/grunt-nw-builder,talss89/grunt-node-webkit-builder,fcardona/grunt-node-webkit-builder,achrist/grunt-node-webkit-builder,abods/grunt-nw-builder,sarge/grunt-node-webkit-builder,vladikoff/grunt-node-webkit-builder,wilkerlucio/grunt-node-webkit-builder,mllrsohn/grunt-node-webkit-builder,leftstick/grunt-node-webkit-builder,shokurov/grunt-node-webkit-builder,shibukawa/grunt-node-webkit-builder,mllrsohn/grunt-node-webkit-builder,achwedyk/grunt-node-webkit-builder,nemurimasu/grunt-node-webkit-builder,vf1/grunt-node-webkit-builder,nwjs/grunt-nw-builder,conceptualspace/nw-builder,GorshSerginio/grunt-node-webkit-builder