Tests for `byteCounter`
Removing `EventStore.Close()`

It's not really used.
Bugfix: Initializing streamIdGenerator correctly
Tests for `EventStore.Query(...)`

They currently fail.
Rewritten major parts of `EventStore.Query(...)`

...fixing bugs and such.
TODO for error string extraction
Parallel execution of all tests
Bugfix: Correcting events ordering
Method for listing streams

More tests are to come.