Some docs suggestions

[addyosmani]

First, fantastic work on this, @vladikoff :) Love it.

Some ideas for the docs:

• Clarify whether this is for existing projects using Grunt or can be used on brand new projects too. Based on what I see, it requires an existing gruntfile so maybe just expand on this.
• Screencast? Would love to see you walking through how you use this in your workflow. Is it primarily to avoid flipping back to the command-line?
• Could this be used with something like Yeoman (specifically the yo scaffold?) - maybe not something for docs, but good to know.