^ Modularized code by pulling the Tet class out of the page and created a .js file for it.

^ Slightly modified Tet colors to be more pleasing to the eyes.
+ Added many JSDoc and regular comments
^ Change shapeMatrices function to become a member of the Tet class
^ Improved Tet class to better handle a type of -1 (empty Tet)
+ Added a, currently unused, perimeter variable to the Tet so I can draw the perimeter of the shape instead of just drawing each block at a time.
+ Added currently unused Tet member functions to deal with changing its shape and perimeter.