Prepare tutorial: Commented out the tests.
Prepare tutorial: Removed the production code.
Prepare tutorial: Added base Board class to get tests to compile.
Merge branch 'master' into tutorial
Merge branch 'master' into tutorial
Merge branch 'master' into tutorial

Conflicts:
	src/test/java/tetris/FallingBlocksTest.java
	src/test/java/tetris/FallingPiecesTest.java
	src/test/java/tetris/RotatingPiecesOfBlocksTest.java
	src/test/java/tetris/RotatingTetrominoesTest.java
Merge branch 'master' into tutorial
Merge branch 'master' into tutorial
Merge branch 'master' into tutorial

Conflicts:
	src/test/java/tetris/FallingBlocksTest.java
	src/test/java/tetris/FallingPiecesTest.java
	src/test/java/tetris/RotatingPiecesOfBlocksTest.java
	src/test/java/tetris/RotatingTetrominoesTest.java
Merge branch 'master' into tutorial
Merge branch 'master' into tutorial

Conflicts:
	src/main/java/tetris/Tetromino.java
	src/test/java/tetris/RotatingTetrominoesTest.java
Merge branch 'master' into tutorial
Merge branch 'master' into tutorial
Merge branch 'master' into tutorial
Merge branch 'master' into tutorial
Merge branch 'master' into tutorial
Merge branch 'master' into tutorial
Merge branch 'master' into tutorial
Merge branch 'master' into tutorial

Conflicts:
	src/main/java/tetris/Board.java
	src/main/java/tetris/Grid.java
	src/main/java/tetris/Grids.java
	src/main/java/tetris/MovablePiece.java
	src/main/java/tetris/Piece.java
	src/main/java/tetris/Point.java
	src/main/java/tetris/RotatableGrid.java
	src/main/java/tetris/Tetromino.java
	src/test/java/tetris/Block.java
	src/test/java/tetris/FallingBlocksTest.java
	src/test/java/tetris/FallingPiecesTest.java
Merge branch 'master' into tutorial

Conflicts:
	src/test/java/tetris/FallingBlocksTest.java