Add TPS play server

[Daenyth]

Inspired by Ostinato:

• http://marianogappa.github.io/software/2017/03/24/ostinato-a-chess-engine-written-in-scala-that-runs-on-the-browser-docker-and-the-repl/

[coveralls]

Coverage increased (+0.4%) to 73.123% when pulling 6338a41 on tps-server into 56d4e20 on master.

[coveralls]

Coverage increased (+0.7%) to 73.366% when pulling 48e8149 on tps-server into 56d4e20 on master.