Depend on esprima-harmony by default.
Depend on esprima-harmony by default.

Transpiling ES6 is what a lot of people are using Recast for, so that use
case should be easy.

Closes #84.

shumov/recast,benjamn/recast,kassens/recast,ipeychev/recast,cpojer/recast,benjamn/recast,benjamn/recast,stefanpenner/recast,ersengultepe/recast,marcioj/recast,fkling/recast,kyldvs/recast,rwaldron/recast