Upgraded Axon, Spring and Ehcache.
Axon upgraded to version 2.1
Spring to version 3.2.7
Ehcache to version 1.5.0-0.5 (Axon dependency).

Reconfigured caching to comply to new version of Ehcache and Axon.
Changed EventHandler annotations on aggregate root to EventSourcingHandler as advised to do in Axon 2.1.