fix key length checking

according to the kafka protocol, a length of -1 indicates null
Merge pull request #2 from nowgoo/patch-1

fix key length checking
fixed consumer MessageSet bug
Suppress redundant warnings on connection failure
Merge pull request #3 from steven-hilder/suppressConnectionWarnings

Suppress redundant warnings on connection failure
FTB-ificiation
Clear Instance functions
reformatted, added some functionality for getting consumer offsets

Conflicts:
	src/Kafka/Consumer.php
Update composer.json
Consumer: minor cleanup
New messages to end of queue..not front...