Fixed compilation failure caused by incompatibility with Java 1.5

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HTTPASYNC-79: Rearranged sequence of operations upon connection lease to eliminate possibility of a connection leak due to race condition on keep-alive boundary

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Upgraded HttpClient to version 4.3.5

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Updated release notes for HttpAsyncClient 4.0.2 release

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Upgraded HttpAsyncClient version to 4.0.3-SNAPSHOT

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HTTPASYNC-81: request producer and response producer #failed methods never get called in case of a connection request failure (for instance due to unknown or invalid hostname)

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HTTPASYNC-81: Premature response consumer termination

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Fixed Java 5 source compatibility

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