more tests for arePositionsAvailable()
fixed rotateMatrix()
improved the tests
add TETROMINO object
refator, add TETROMINO_BASE_COORDINATES
redefine base coordinates
reorder the tests
adjust base coords for SQUARESHP and TSHP
use tetrominoName instead of tetrominoType
move random.js to the utility/ folder
changed Tetromino matrix for cartesian plane
changed Tetromino matrix for cartesian plane
implemented tetromino rotation
add Tetromino.getRotatedPositions()