Added publish with qos test
Removed options for subscribe - was getting too complex
memory ascoltatore will now pass its callback the original topic (including wildcard) as final argument; this allows the callback (e.g. mosca) to lookup the
correct client options
mosca changes required too
Reverted to previous behaviour - changed the fix in mosca
Merge pull request #58 from davedoesdev/mqtt_tests

Removed the custom options from the `subscribe` method.