Update mam.coffee

Ah Leonardo you just keep pushing me and pushing me to improve my coding skills, first by using your library, now by forcing me to figure out what it does so I can reproduce it, since you so unceremoniously removed support, in defiance of quote, " Rather than make it hard for users to do what they want to do, on the (very valid) assumption that some of them will do bad things, or things they don't really want to do, it is better to make it easy for users to recover from those mistakes, and for others to recover easily from any side effects of those mistakes" Anyways cheers I appreciate the motivation :)