Revert "Improve functions naming in `Tty2048.Grid`"

This reverts commit e6206c036e7429f5cc42335c17d0e32128da4c15.
Introduce `Tty2048.Grid.make/1` function
Simplify `Tty2048.Grid.transpose/1` definition
Add initial implementation of `Tty2048.Game` server
Add Travis CI config