fixed build bail in example. downloading nwbuild version is old.
fixed build bail in example. downloading nwbuild version is old.

nwjs/nw-builder,GrabCAD/node-webkit-builder,joshterrill/nw-builder,modulexcite/nw-builder,manviny/nw-builder,imperiumzigna/nw-builder,nwjs-community/nw-builder,donkeycode/nw-builder,marianoguerra/nw-builder,mllrsohn/nw-builder,Crunch/nw-builder,ArmorText/nw-builder,nwjs/nw-builder,GrabCAD/node-webkit-builder,manviny/nw-builder,GrabCAD/node-webkit-builder,cypress-io/nw-builder,mllrsohn/node-webkit-builder,mcanthony/nw-builder,imperiumzigna/nw-builder,marianoguerra/nw-builder,mllrsohn/node-webkit-builder,mllrsohn/nw-builder,mcanthony/nw-builder,joshterrill/nw-builder,donkeycode/nw-builder,Crunch/nw-builder,nwjs-community/nw-builder,ArmorText/nw-builder,modulexcite/nw-builder,cypress-io/nw-builder