Added PlayerTest.java
Implemented PlayerTest and CardTest.

Modified Beanfield, BeanometerEntry, Card, Pile and Player.
Implemented Player and PlayerTest to follow the Bohnanza game logic.
Modified Pile, BeanometerEntry and added an arbitrary beanometer to each
card that is initialized for testing purposes.
Merge pull request #2 from KevinBlom/oTests

O tests