Fixes #101: Moved existing RefreshEndpoint logic to a new RefreshSupport class.#103

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Commits on Mar 21, 2016

Moved existing RefreshEndpoint logic to the new RefreshSupport class.
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Fixed shutdownHooksCleaned test in RefreshEndpointTests.
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Commits on Mar 22, 2016

1. Renamed RefreshSupport to ContextRefresher.
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