Structure for Easy Solving
'Won't be needing this for a long time'
Merge changes from board_logic into easy_solving

Just a couple of things we need in here
Layout
Updated .travis.yml
Board.toString() + Board.getMissingRow()
+ Board.toString() + Test
+ Board.getMissingRow() to get an Array of missing numbers in a row + Test
~ Way of producing testBoard changed from function to a simple assignment
Update .travis.yml
Merge remote-tracking branch 'origin/master'