Alter the API to work on two separate sets of structures
Implement equality check for maps .equals()
Tweak SharedData persistence of maps
Add destroy method for ClusterManager (with implementations)

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# On branch sharedmap_polymorphic
# Changes to be committed:
#   (use "git reset HEAD <file>..." to unstage)
#
#	modified:   vertx-core/src/main/java/org/vertx/java/core/shareddata/SharedData.java
#	modified:   vertx-core/src/main/java/org/vertx/java/core/shareddata/impl/DefaultSharedMap.java
#	modified:   vertx-core/src/main/java/org/vertx/java/core/shareddata/impl/DefaultSharedSet.java
#	modified:   vertx-core/src/main/java/org/vertx/java/core/spi/cluster/ClusterManager.java
#	modified:   vertx-hazelcast/src/main/java/org/vertx/java/spi/cluster/impl/hazelcast/HazelcastClusterManager.java
#	modified:   vertx-testsuite/src/test/java/org/vertx/java/fakecluster/FakeClusterManager.java
#