Error page handler cache - sake keeping commit
MBean reporting support
Trimming mbean params
Added synchronization since cache gets write back on hit
Added unit tests
Moved all caching into impl packages
Unit tests for ErrorPageCacheImpl and minor code cleanup
Merge branch 'enhancement/error-page-handler/cache' of github.com:davidjgonzalez/acs-aem-commons into davidjgonzalez-enhancement/error-page-handler/cache
removing unnecessary synchronization by using AtomicInteger; fixing Findbugs issue about default charset