Meteor 0.5.8: security fix, AppCache, DB transforms, new Deps

For me, DB transforms will be the most useful of this update. I've been pained to parse the data after a fetch() call.

I second that! Thanks, Meteor team, for including transforms! Now it's time to refactor some code... :)

Hallelujah, AppCache support. This is a game-changer.

METEOR GOES HAM