Timers
Similar to Y.later, but sooner. Y.soon standardizes the way to make
something happen asynchronously but without a timed delay. Under the covers,
Y.soon will call setTimeout if it must, but it will try to use the more
efficient setImmediate or process.nextTick depending on the environment.
Y.later will go through a deprecation process and join this module after
it has fully been deprecated.
