#5 Collision detection

[g.williamson]

The EqualsMethodTester uses random generated test data test property significance in object equality. As a result, it is possible that a generated value may be the same as the value used by the provided "equivalent object" Factory for a given property. If this happens every time, then the objects will always be equal and the non-equal case will not be tested. Implement logic to detect test value collision. If values collide every time and the non-equal case cannot be tested, an exception should be thrown.