updated down feature
Remove k in the inner loop, change for j+1

change k for j+1
updated down feature
Merge branch 'develop' of https://github.com/nmaguirre/eiffel-2048 into develop
Adding tests for down feature and adjustments in down feature
Merge branch 'develop' of https://github.com/nmaguirre/eiffel-2048 into develop
Pushing down feature and its respective tests