expose CacheManager to be accessible as an MBean

[Galder]
>>> Couple methods, discussed in more detail at http://tinyurl.com/lq688t section 11.2
>>>
>>> 1) Use the CacheManager to create your cache; the CacheManager is available in JNDI at java:/CacheManager. See Section 11.2.1.
>>>
>>> 2) Use CacheJmxWrapperMBean and it's "cache" mbean attribute. Simplest way is to deploy it via a -service.xml. Section 5.4.2 of JBC 3.1 docs at http://tinyurl.com/m49qen has other methods.
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