- Removed the watch from rg.sass task

I've removed the watch function from the rg.sass task, this allows modular scss to be compiled. Previously, if I had a `scss/subfolder/module.scss` file and used @import to import it into `app.scss`, it would be compiled into `css/subfolder/module.css`, when I only wanted it to be added to `css/app.css`. The user will have to now setup a watch task on the rg.scss task instead.

There is also a fix for a misspelled function in the `gulpfile.js`.