out routine at CELL_2048 and its respective test implemented
Merge branch 'sprint_develop_28082014' of https://github.com/nmaguirre/eiffel-2048 into sprint_develop_28082014
Changes in BOARD_2048

Change implemenation of make_empty to fix a warning and change the name
of features rows to Rows and columns to Colums (this are constants, the
name should begin with uppercase)
Merge branch 'sprint_develop_28082014' of https://github.com/nmaguirre/eiffel-2048 into sprint_develop_28082014
Merge branch 'sprint_develop_28082014' of https://github.com/nmaguirre/eiffel-2048 into sprint_develop_28082014