Added weierstrass routine.
Added weierstrass routine.

RobertoMalatesta/envisionjs,notepad104/envisionjs,HumbleSoftware/envisionjs,notepad104/envisionjs,HumbleSoftware/envisionjs,RobertoMalatesta/envisionjs,bigspotteddog/envisionjs,bigspotteddog/envisionjs,notepad104/envisionjs,RobertoMalatesta/envisionjs