Wall .initialize method implemented.
moveable instances get initial x and y values
Broken tests of world.rb fixed.
I shape of moveable class implemented.
L shape of moveable objects implemented.
L, R and O shapes implemented.
Worldspec/tetris/world_spec.rbadd_moveable implemented.
Moveablespec/tetris/moveable_spec.rbmove method(:d) method impimented.
Vector class implemented for positions.
Moveablespec/tetris/moveable_spec.rbmove(:r) implemented.
leftward movement for Moveable implemented.