Footer is sticky-ified

Here are the code changes to get the footer sticky.  Here's how I did this:

I "inspected element" for the flixter that we have up in heroku and went through the elements that were different and made the HTML match exactly the same.  Then I stole the CSS from the flixter app I had.  Here are the changes that I needed to make.
I also commented this line above out.  The line above is what makes the footer sort of always not visible on the page, so you can leave that if you like that style better.  Without that line it will stick to the bottom of the page OR if there's too much content make you have to scroll for it.  You can see the difference between having it commented, vs actually on the page by comparing the difference between this app and http://flixter.herokuapp.com/