Pull changes from master into dev

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<a href='https://www.codereviewhub.com/AzureAD/azure-activedirectory-library-for-objc/pull/235?approve=1'><img src='http://www.codereviewhub.com/site/github-approve.png' height=26></a>&nbsp;<a href='https://github.com/AzureAD/azure-activedirectory-library-for-objc/pull/235'><img src='http://www.codereviewhub.com/site/github-refresh.png' height=26></a>
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