Missing trailing slash from firebase url

You have my permission to scream and break things when you see what I had to do to get your app working.

The first thing I did was switch to the un-minified code for dubugging. I was able to get the app working by copying and pasting the project.js code straight from the example on angularjs.org. So, that led me to believe that something was wrong in your minified code. However, when reverted your app.js back to it's original state it was still broken, so I knew that it wasn't the minified code after all.

Then I started doing a line by line comparison of your code with the example code and noticed the issue with your url. 

Indeed, when the trailing slash is added, it works just fine.