[gh #64](https://github.com/m6w6/libmemcached/issues/64) and
[gh #21](https://github.com/m6w6/libmemcached/issues/21):
clarify documentation on replication.
+* Fix [gh #95](https://github.com/m6w6/libmemcached/issues/95):
+ MEMCACHED_CALLBACK_GET_FAILURE and MEMCACHED_BEHAVIOR_BUFFER_REQUESTS
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