Bump NPM version to 0.6.6 in preparation for publishing.
Bump NPM version to 0.6.6 in preparation for publishing.

rafaelstz/regenerator,rafaelstz/regenerator,facebook/regenerator,kittens/regenerator,facebook/regenerator,Jericho25/regenerator,liviuignat/regenerator,sebmck/regenerator,RReverser/js-goto-transpiler,RReverser/js-goto-transpiler,kittens/regenerator,juliocanares/regenerator,Jericho25/regenerator,juliocanares/regenerator,liviuignat/regenerator,facebook/regenerator,sebmck/regenerator