Room enhancements, e.g. board size

Conflicts:
	src/main/java/hu/bme/aut/ladder/data/entity/PlayerEntity.java
	src/main/java/hu/bme/aut/ladder/data/service/impl/GameServiceImpl.java
	src/main/java/hu/bme/aut/ladder/strategy/impl/SimpleBoardStrategyImpl.java
	src/test/java/hu/bme/aut/ladder/data/service/impl/GameServiceImplTest.java
	src/test/java/hu/bme/aut/ladder/strategy/impl/EarthquakeBoardStrategyImplTest.java
Merge pull request #22 from wther/room-enhanchments

Room enhancements, e.g. board size