move "skip to main content" link above nav
move "skip to main content" link above nav

Reduce the priority value of the function that displays the "skip to
main content" link.  This places it above the nav

Fixes #26

michaelcarwile/bootstrap-genesis,bryanwillis/bootstrap-genesis,michaelcarwile/bootstrap-genesis,salcode/bootstrap-genesis,michaelcarwile/bootstrap-genesis,salcode/bootstrap-genesis,bryanwillis/bootstrap-genesis,bryanwillis/bootstrap-genesis,salcode/bootstrap-genesis