Updated pom.xml for HttpClient 4.3.x branch

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HTTPCLIENT-1455: fixed code sample in the 'Caching' section of the tutorial

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HTTPCLIENT-1456: Request retrial after status 503 causes ClientProtocolException

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HTTPCLIENT-1457: Incorrect handling of Windows (NT) credentials by SystemDefaultCredentialsProvider

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HTTPCLIENT-1458: SystemDefaultCredentialsProvider always uses 'http' as an authentication protocol to Authenticator#requestPasswordAuthentication call

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Unused import

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Use AtomicBoolean to hold storage status

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Avoid using implementation classes shipped with Android in HttpMime, HC Fluent, and Caching modules

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