Oak 1.0.3 release notes

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[maven-release-plugin] prepare release jackrabbit-oak-1.0.3

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

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/branches/1.0@1613110 13f79535-47bb-0310-9956-ffa450edef68