Bump NPM version to 0.4.18 in preparation for publishing.
Bump NPM version to 0.4.18 in preparation for publishing.

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