Decoupled StackExchangeChat and JavaBot. 

Added Interface to describe classes that 'produce' stuff and can be subscribed to. Added interface describing minimal ChatInterfacing functionality (namely queryMessages and sendMessage). see #9
This will not always work. The javadoc explicitly specifies that non-permanent references may be GarbageCollected from the Logger pool at any time. It already happened on my machine, that Loggers disabled by name were GC'd and then spammed my console with irrelevant warnings.