Fixed name of promise module
Changed name of 'context' veriable to '_context'
Changed conflicted name of '_config' method to '_configure'
Changed name of 'msg' varialbe to 'message'
Changed variable name from 'host' to '_host'
Refactored pygrapes.core and pygrapes.adapter's (Local and Zmq) so adapters will receive Promise instance when calling commands and Core will intercept communication between command and adapter so serialization/deserialization could take place
Changed socket type for pygrapes.adapter.Zmq
Added example for ZeroMQ backend