HADOOP-9629. In CHANGES.txt, move attribution of Azure-related patches to trunk section.

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HDFS-6587. Fix a typo in message issued from explorer.js. Contributed by Yongjun Zhang.

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HADOOP-10728. Metrics system for Windows Azure Storage Filesystem. Contributed by Dexter Bradshaw, Mostafa Elhemali, Xi Fang, Johannes Klein, David Lao, Mike Liddell, Chuan Liu, Lengning Liu, Ivan Mitic, Michael Rys, Alexander Stojanovic, Brian Swan, and Min Wei.

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