Pynsq

* 100 - add `Reader.close()` (thanks jonesetc)
* 99 - don't redistribute `RDY` when there aren't any connections
* 98 - send `RDY` before `FIN`/`REQ` (for nsqio/nsq404)
* 96 - fix exception when `Writer` has no connection

* 91 - change order of max attempts check
* 89 - properly handle `requeue(backoff=False)` when in backoff state
* 87 - verify keyword args passed to `Reader` (thanks stanhu)
* 85 - fix `nsqlookupd` addresses specified without scheme

* 84 - use a named logger (thanks virtuald)
* 83 - add `DEFLATE` support (thanks wtolson)
* 80 - configurable `nsqlookupd` HTTP request timeouts (thanks stanhu)
* 78 - fix potential `Reader` connection index error (thanks xiaost)
* 77 - more flexible `nsqlookupd` configuration
* 76 - fix potential out-of-order backoff/resume
* 72 - `AUTH` support
* 73 - support 64char topic/channel names (thanks svmehta)

IMPORTANT: this is a bug-fix release to address an issue where `Reader` would raise
an exception when receiving a heartbeat.

* 68 - fix heartbeat_interval bug

IMPORTANT: this is a bug-fix release to address an issue preventing `Reader` from
consuming messages.

* 63 - fix connection attributes bug; `heartbeat_interval` as ms
* 65 - fix invalid arguments during read error
* 66/64 - add integration tests; improve testing matrix

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 (thanks elubow)
* 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`