I've removed the duplicate info from brackets.config.json. The idea behind splitting the file up was to (1) correctly form a package.json for NPM without our Brackets-specific config data and (2) remove any duplicated info from src/package.json (now config.json).

Keeping this checked in allows users to skip a 2 steps in the repository setup process (installing node, npm install). I know it's not ideal to keep in the repo.

I don't know that we can do something similar to www/dev. I'll try out some ideas.