Issue #1 - Added ability for the user to create an octahedron.  Updated createVerticalTriangle function to have an option for including the base or not.  Created a createPyramid function that has the option for including the base or not.  Pyramid2 was updated to call the createPyramid with the base option.  Octahedron was created to call createPyramid twice (once for the top half and once for the bottom half) without the base.