Issue #1757466: Prefix all navbar classes to prevent theme clashes

Signed-off-by: J. Renée Beach <splendidnoise@gmail.com>
Issue #1757466: Prefix all navbar classes to prevent theme clashes; override margins on .navbar-toggle. The conflict was raised in the Bootstrap theme.

Signed-off-by: J. Renée Beach <splendidnoise@gmail.com>