We talked offline, but for posterity's sake…

My concern is that jstransform and react end up with different versions of our esprima. This could cause problems with browserifying. We could ensure that they use the same version with some manual work, but if all we need esprima for is `Syntax`, then we should probably make jstransform export that. @jeffmo is looking into a way to make that possible.

Now that said, I don't think I have any issue getting this in and iterating in master.