First steps towards making Heller use Kafkas 0.8 API
Added a rather pointless spec for #multi_consume
Updated specs and Consumer
Added TopicConsumer
Added some integration specs
Removed error check for now
Changed description of pending spec
Major cleanup and rewrite

Removed all old code that used Kafka 0.7.2 and
added new implementation of Heller::Producer that
uses the Kafka API for 0.8.0-beta1.
Currently working on getting a SimpleConsumer
going.
Merge branch '0.8'