Resolves deadlock issues by making synchronous objectForKey: methods truly synchronous#37

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Commits on Oct 11, 2013

Fixes deadlock issue for synchronous objectForKey:
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Commits on Oct 12, 2013

Refactors asynchronous objectForKey:block: methods to use synchronous objectForKey: counterparts
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Optimizes code by removing unnecessary method calls and postponing object initializations
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