can move down routine implemented and its tests
Merge branch 'sprint_develop_28082014' of https://github.com/nmaguirre/eiffel-2048 into sprint_develop_28082014
implement nr_of_filled_cells in BOARD_2048
Merge branch 'sprint_develop_28082014' of https://github.com/nmaguirre/eiffel-2048 into sprint_develop_28082014
Merge branch 'mi_rama' into sprint_develop_28082014