had to add line to get mean stack working on my mac: enable node to server bower components

The default app tries to load bower_components from /lib/[component]. They weren't set up to be served, so I had to add the following line to express.js:

* app.use('/lib', express.static(config.root + '/bower_components'))

FYI, this was my first time working with a lot of this stuff, so this might not have been the most efficient solution to getting the project working on my computer.