nimble.webmaker.org node server

This should be a good start for us to run Nimble.webmaker.org and deploy this with WebmakerAuth solution in the future!
I don't like the idea of having this whole file live here, because it's going to mean that we have to make changes in two places if we want to modify this file (here and in nimble itself).  A better option would be to programmatically rewrite this code in a grunt step.  Then we can leave the code as is in Brackets/Nimble, but have it do what you have here in nimble.webmaker.org.