Use promises in Gulp example
Use promises in Gulp example

Gulp supports returning promises to make the task not parallel, so just return it, and use promise-like functions for error logging.
Also, fix a couple typos.
achrist/node-webkit-builder,ArmorText/nw-builder,imperiumzigna/nw-builder,GrabCAD/node-webkit-builder,nwjs-community/nw-builder,imperiumzigna/nw-builder,mllrsohn/node-webkit-builder,Crunch/nw-builder,donkeycode/nw-builder,manviny/nw-builder,achrist/node-webkit-builder,mcanthony/nw-builder,modulexcite/nw-builder,joshterrill/nw-builder,mllrsohn/nw-builder,ArmorText/nw-builder,nwjs/nw-builder,modulexcite/nw-builder,marianoguerra/nw-builder,mllrsohn/node-webkit-builder,manviny/nw-builder,achrist/node-webkit-builder,donkeycode/nw-builder,joshterrill/nw-builder,nwjs-community/nw-builder,GrabCAD/node-webkit-builder,marianoguerra/nw-builder,mcanthony/nw-builder,nwjs/nw-builder,cypress-io/nw-builder,GrabCAD/node-webkit-builder,mllrsohn/nw-builder,Crunch/nw-builder,cypress-io/nw-builder