#47 get rid of containsKeys()
 #47 change API to use Map.Entry instead of Cache.Entry
 #47 trivial implementation of bulk ops
 #47 implementation of bulk ops with readers/writers + basic tests
 #47 better test coverage + bug fixes
 #47 add javadoc for Store's bulk compute methods
Merge pull request #105 from lorban/issue-47

Merged #105.
Issue #27 Added Status enum and accessor on CacheManager & StandaloneCache
Issue #27 Got rid of the Ehcaching indirection.
CacheManagerBuilder now operates like StandaloneCacheBuilder:
 - Instantiates an EhcacheManager instance directly
 - Expects EhcacheManager to implement all known CacheManager subtypes
Issue #27 Some sketch of a lifecycle management strategy
Issue #27 Refactored Status management in dedicated class
 - Added listeners for state transitions
Issue #27 added CacheManagerListeners
Issue #27 If a StateChangeListener throws, make sure we finish the transition
Issue #27 wired Status into Ehcache
Issue #27 Don't release CacheLoaders this way
Issue #27 Wired Ehcache to be Maintainable, and Store lifecycled
Issue #27 added lifecycle test on Ehcache
Issue #27 Added Javadoc