Created the Expectation and BuiltInTester classes and updated the Dummy
class to test the new classes.

-Expectation: simple wrapper at this point, but probably not going to
change all that much because it doesn't do much anyways
-BuiltInTester: singleton class created and "expecting" functionality
added, but logging doesn't do anything except clear the expectation list
(no processing of logs, let alone output)

Everything seems to be working so far