Update to gulp 3.5.0 and CoffeeScript 1.7.1

I updated the following dependencies:
* gulp-stylus to v0.0.11
* gulp-watch to v0.5.0
* gulp to v3.5.0
* coffee-script to v1.7.1
* gulp-coffee to v1.4.0
* gulp-jade to v0.4.0

In the gulp.js file, require('coffee-script'); was modified to follow the new syntax introduced in CoffeeScript 1.7

And finally, run method in the file gulp.coffe was changed to start, because run is deprecated in gulp 3.5