DATAREDIS-246 - RedisCacheManager.getCache() does not match the logical of CompositeCacheManager.

By default RedisCacheManager lazily initializes RedisCaches when requested. To put it into static mode a defined set of cache names has to be passed to the CacheManager.

We changed the implementation so it  makes use of AbstractTransactionalCache introduced in Spring 3.2 which properly registers caches. Additionally the loadRemoteCachesOnStartup switch allows to retrieve and initialize existing caches by loading keys form redis server.

Further on RedisCacheManager can be set in transaction aware mode so that values are only put into cache after successful commit of surrounding transaction.

Original pull request: #33