fix(doc-gen): Run Gulp on Windows too
fix(doc-gen): Run Gulp on Windows too

Using node_module/.bin/gulp will enable to gulp command to run
both on Windows and Linux. In its current form, the default action of
executing a Javascript file on Windows does not use node.
Requires quotes around the command to correctly resolve path on Windows

Closes #6346

campersau/angular.js,campersau/angular.js