In package.json, define our main entry point for electron, and add a
node script to start it up.
Add main.js from Electron/electron-quick-start with two modifications.
1. Load background.html instead of index.html
2. Disable node integration in the renderer
At this point we can load the background page in a window
with `npm start`, though it currently breaks on missing chrome app APIs.
// FREEBIE
Set up grunt with tasks for:
* preen - deletes unused files from bower_components, configured in
bower.json
* concat - concatenates preened bower components, configured
automagically from the preen config
It's worth noting that this setup assumes the order of files within a
package doesn't matter. This is usually true since we often include only
one file from the package.
