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