Provide IE filtering functionality to Modernizr.

Forgot to define the Internet Explorer filters.  Now we are truly
loading the small stylesheets for non-IE browsers.
This gets us a YSlow score of 94.
And a Load time of 2.99s (onload 2.19s).
Roll in custom Modernizr build.

This custom build is smaller and contains just what is needed
(including rem unit tests).
Add favicon HTML line.