rest: renamed ids for DataSource and FilterChainReference to "id"
test: added DataRepositoryTest
test: added FilterChainReferenceRepositoryTest and
DataSourceRepositoryTest
test: added RepositoryCacheTest
db: minor renmaing in RepositoryCache
Switched from com.googlecode.jmockit to org.jmockit

The google one seems to be older / less usable
test: added DbInsertionFilterTest
test: added NotificationFilterTest
test: added FilterChainManagerTest
filter: added equals and hashCode to FilterChainExecutionInterval
test: added FilterReferenceManagerTest