#321 Simple integration test was added for DyBase

@yegor256 As for me it's pretty unclear description (better than mine thought), because:
1) Should DyBase be implemented in scope of the task? We already have todos in DyBase to implement it.
2) Do we really need all methods in all classes in com.thinkdeck.dynamo package to be implemented? It's a lot I guess.
But I understand your point ... you want implementor to ask questions and figure out what's needed to make the test works by herself.