Changes to Improve Accessibility

This release is my first attempt to receive the accessible-ready tag
from WordPress.org.  Very few themes have yet met this standard.  I had
to rip out a bunch of the CSS left over from the UU2011 theme so that
the theme uses more styles from _s which includes a bunch of
accessibility features.  I also added a functions.js file with code from
the Twenty Fourteen theme that allows for keyboard navigation of the
main menu (very hard to get working).