Improved polling from Jdbc - INT-2200
To accomplish all that schema change was required so new schemas are commited as well
INT-2544b polished based on Artem's comments
INT-2544b more polishing based on Artem's comments
INT-2544b more polishing based on Artem's comments
INT-2544
defined doPollForMessage(..) method so it could be overriden with custom query to get a single message from the DB
INT-2544
polishing, removed unused import
INT-2544
polishing, added protected getter for JdbcOperations, polished Javadocs
INT-2544 polishing
INT-2544b polishing
added fallback on update when create MessageGroup query fails, fixed the update date
INT-2544b polishing PR comments
INT-2544b polishing white spaces
INT-2544b polsihing white spaces