Test framework does not test previous version

[jonathanfine]

It is clear from #59 Signature of Minecraft constructor has changed - previously took a connection that the test framework is neither running tests against the previous version, nor using test data obtained by logging the previous version.

Compatibility with the previous version is the primary goal of the new revision, and so this is not a minor error.

I seems that tests have been written against the new version - which of course does not test compatibility with the previous version.