Use nav for proper HTML5 ARIA role mapping

BS3 commit a19ed6dcc198143a13e0a945c4972c67a86ba77a
Ensure proper use and location of role="banner"

BS3 commit b4081e6cd4c3dfd88c479f23438c455d755de782
add event prefixes

BS3 commit 5c6b995971a7795a1a95db2243d6fe2c006b1098