Create new, pure js validator that is faster

On example data I downloaded, Joi runs in 2484 milliseconds.  Joy runs in 38 milliseconds and I believe it is verifying the same stuff.

@jebeck @nicolashery Give this a once over and make sure you believe it's verifying the same stuff as well.

I veered off from the Joi API in a couple places.  The biggest is that I assumed that things are generally required and if they are optional, that should be pointed out.  Joi does it the other way and forces you to specify what is required.
The regex for isADeviceTime should be better and more specific like `isoPattern` (only allowing certain digits in year, etc.)

And re: `isoPattern` it allows timezone offset timestamps. If we're writing our own regex, might as well ban anything that's not Zulu time, right?