Update application.html.erb

Removed CSS attributes which are not required in HTML 5.  Moved JS around.  This should prevent the JS from blocking the loading of the main content.  Could be further optimized by minification / concatenation of HTML / JS / CSS
I did some research on where to put the GA code, and there's disagreement as to whether it's best to put it in the header or the body (since GA's update a few years ago, the snippet is asynchronous, so it's fine in the header). Since the official docs say to put it in the header, I'd like to leave this in the header.