Allow tasks to be streaming, for mapred and keys.
Fix typo.
Use EventEmitters for streaming.
Merge branch 'master' into mm-streaming-mapreduce

Conflicts:
	index.js
Rework event triggers.

Triggers the decoded response to the emitter instead of the growing
reply object.
Default streaming to false.

Ensure backward compatibility for the interface.
Merge branch 'master' into mm-streaming-mapreduce
Merge pull request #3 from roidrage/mm-streaming-mapreduce

Support streaming operations