Bump NPM version to 0.8.19 in preparation for publishing.
Bump NPM version to 0.8.19 in preparation for publishing.

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