Added missing commons-collection dependency and made sure that all
Spring deps are upgraded to 3.1.4.
Wrapped Linkd init in a transaction and updated Linkd tests with
@Transactional.
Minor cleanup.
Updated all Linkd tests so that the JdbcFilterDao is initialized
properly. Simplified the applicationContext-linkdTest.xml so that it
just uses the applicationContext-dao.xml more.
Fixed PollContextTest.