ICache test showing effect of batching on performance
review feedback addressed
property files added
unused map removed
writePercentage changed to writeProbability as it fits OperationSelector better.

Explicit probability range checking removed as OperationSelector is doing it as well.
cache is auto-created on getCache() - no reason to create it explicitly.
reverting previous change - getCache() returns null unless the cache has been explicitly created
Merge pull request #421 from jerrinot/master

ICache test showing effect of batching on performance