Middleman config.rb updates

Signed-off-by: Renato Carvalho <renatolz@gmail.com>
Gem update

Signed-off-by: Renato Carvalho <renatolz@gmail.com>
Updating bower components. Update Bourbon, Neat and  nwmatcher

Signed-off-by: Renato Carvalho <renatolz@gmail.com>