Switching to newer release of Modernizr, updating styles from Codepen

Signed-off-by: Matt Bernhardt <mjbernha@mit.edu>
First crack at Libguides v2

Initial attempt at combining styles for the second version of libguides.

Also, some minor content changes to the header and footer based on
recent changes.
Merge pull request #3 from matt-bernhardt/libguides-v2

Setting up Libguides v2