responsive menu
Pruebas de menú responsive, sin finalizar)
Merge branch 'responsive' of https://github.com/ccarruitero/mozilla-hispano.org into responsive-mio

Conflicts:
	html-responsive/responsive.css
Solución de merge
Mejora visual, faltaría probar efectos de persiana al mostrar / ocultar submenú
Merge pull request #85 from stripTM/responsive-mio

Pruebas de menú responsive, sin finalizar)