added in the MMenu.js plugin for the 'drawer menu' effect

added in the MMenu.js plugin for the 'drawer menu' effect. I have no strong attachment to it. If it doesn't do what we need let's consider pulling it out and doing it ourselves. Also, "welcome to the neighborgood" isn't something I'm in love with. just playing around. merge it in or +1 it if you don't have problems with what I've done here.