0.6.0

This release includes an array of new features, refactoring, and bug fixes.

Primarily, support for sampling channels, modifying output buffering, enabling Snappy compression, and setting user agent metadata.

Finally, there was a large internal refactoring in #52 to achieve better separation of concerns and pep8 compliance in #53.

• #59 - add nsq_to_nsq example app (thanks @ploxiln)
• #58 - add user agent IDENTIFY metadata
• #57 - add channel sampling feature negotiation
• #55 - update Message docs (thanks @dsoprea)
• #53 - pep8
• #52 - evented refactoring
• #49 - add output buffering feature negotiation
• #50 - add Snappy compression feature negotiation
• #51 - fix periodic timers when not configuring nsqlookupd