Added more options to Conv2D layer
Added more options to Conv2D layer

lilleswing/deepchem,ktaneishi/deepchem,miaecle/deepchem,rbharath/deepchem,Agent007/deepchem,deepchem/deepchem,lilleswing/deepchem,miaecle/deepchem,peastman/deepchem,peastman/deepchem,ktaneishi/deepchem,Agent007/deepchem,rbharath/deepchem,Agent007/deepchem,ktaneishi/deepchem,deepchem/deepchem,miaecle/deepchem,lilleswing/deepchem