-Finished unit test for making and displaying blocks
- Added another unit test function that tests if coordinates at y+1 below
  each of a block's coordinates is part of the block.
- Grid prints with coordinates lining the left and top
- Added move block function and its unit test. Test passed for moving
  one y-coord down with no obstructions
- Added test function for moving block against an obstruction
- Added test for dropping blocks. Test passes
- Added rotation functions and corresponding unit tests. Tests okay.
- Added boolean checks for moving block left and right
- Added check line functions and clearing a line