__init__()
Tetrominoes moved in to Shape.py because it wasn't really worth splitting
added description to class Tetrominoes
defined function that returns current shape
defined setShape() which is a method creates a shape based on its arrangement coordinates
now setShape() is defined, so added default shape to __init__()
added setRandomShape()
added coordinates and rotation methods. this concludes Shape.py
defined numLinesRemoved
added clearBoard()
defined board (list)
filled attributes