[VOTE] Release ZooKeeper 3.1.0 (candidate 1)

[Patrick Hunt]

I've created a new candidate (rc1) that fixes an issue raised by a user 
(thanks Stu!) during review:
https://issues.apache.org/jira/browse/ZOOKEEPER-291
The release notes were also updated to reflect this change.
Otw there are no other changes.

*** Please download, test and VOTE before the
*** vote closes EOD on Monday February 9.***

http://people.apache.org/~phunt/zookeeper-3.1.0-candidate-1/

Should we release this?

Patrick