Chronicle resource management, refactoring

CHRON-32 VanillaExcerpt findMatch/findRange not working 
CHRON-30 Make VanillaDataCache and VanillaIndexCache configurable
CHRON-29 Make NativeExcerpt/Tailer/Appender as IndexedChronicle's inner classes of IndexedChronicle
CHRON-28 Add clear() to Chronicle
CHRON-27 Check that resources are cleaned-up on test completion
CHRON-26 Add method/option to force excerps cleanup on Chronicle.close
CHRON-25 Decrement ref count on Excerpt.close()
CHRON-24 Add some test that fail if they take too long to run so ...