Application.js not being loaded

I'm using rails 4.1.8 with ruby 2.2.0 - it seems like my application.js
file is not being loaded. I put up a question on Stack Overflow
yesterday but it's getting little attention and it's a matter of some
urgency that I fix this. I have a simplified version of my project up on
a public github repo here:

And here's a link to my original question on SO and everything I've
tried so far to debug/fix this:

Hopefully someone here will be able to help with this problem!

Is this in development or production mode?
Have a look at the html source in the browser, what do you see there?
Copy/paste the beginning of that here.