Update gulpfile.js
Update gulpfile.js

Fixes the sass (on errors) & watch tasks.
niallobrien/generator-ee-foundation,niallobrien/generator-gulp-foundation,mininao/generator-gulp-foundation,chocolateslice/generator-gulp-foundation,chocolateslice/generator-gulp-foundation,niallobrien/generator-gulp-bootstrap,niallobrien/generator-gulp-foundation,niallobrien/generator-gulp-bootstrap,mininao/generator-gulp-foundation