Handling Large Scale projects article

Time and again i see users falling into the fallacy of having multiple `Gruntfile.js` files in their projects and asking questions about how to run tasks for them...

This article tries to provide a path into scaling Grunt for large teams, it is designed to exist under the `Documentation --> Advanced --> Multiple Gruntfiles` pos in the gruntjs site, the title although deceiving, is what will attract the target audience's attention and provide useful SEO for the issue.

I'll make it a blog post if you don't want the piece.