Enable JNDI binding of Cache/CacheManager out of the box

Note that implementing this has no urgency since it does not really help Brian S for the JBoss AS integration.
See: http://lists.jboss.org/pipermail/infinispan-dev/2009-October/001663.html

So, I'm thinking that we could have a <jndi name="xyz"/> configuration
option both at the global level (for Cache Manager) and at the Cache
level. So,

• if <jndi/> was present in the global section, we'd bind CacheManager
  to java:CacheManager

• if <jndi name="xyz"/> was present in the global section, we'd bind
  CacheManager to java:xyz

• if <jndi/> was present in the cache section, we'd bind Cache to
  java:<name-of-the-cache>

• if <jndi name="xyz"/> was present in the cache section, we'd bind
  Cache to java:xyz