Implemented validation spec.
Implemented validation spec.

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