Mouse enabled
Receiving mouse clicks
Title correction
Identifing clicked piece
Piece is now moving
Merge branch 'using-mouse-to-move-pieces' of http://github.com/ismael-liceras/pyzzle into using-mouse-to-move-pieces
Pieces are moving (a starting point)
Pieces are already moving to the right way
Movement is now always soft
diagonal movement forbidden
Fixed double click issue