Use Nuvola.format in Nuvola.log & warn

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>
Add overriding of newWindow in NavigationRequest

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>
Add help resources to footer

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>