ACCUMULO-970 Update CHANGES for 1.5.0-RC5

git-svn-id: https://svn.apache.org/repos/asf/accumulo/branches/1.5@1484976 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare release 1.5.0-RC5

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[maven-release-plugin] prepare for next development iteration

git-svn-id: https://svn.apache.org/repos/asf/accumulo/branches/1.5@1484985 13f79535-47bb-0310-9956-ffa450edef68
ACCUMULO-970 merge metadata to trunk

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