OPAL-2451: Clear errors
Merge pull request #544 from emorency/OPAL-2451-error-messages

OPAL-2451: Clear errors
OPAL-2438 - make sure to decode when treating bookmark related operations in case their resource has been URL encoded
OPAL-2442: Setting characterSet as a property
OPAL-2438 - in case of an unsupported encoding exception, made sure to print the server error if any was present
Merge pull request #545 from emorency/OPAL-2451-error-messages

OPAL-2442: Setting characterSet as a property
Merge pull request #546 from kazoompa/bug-OPAL-2440

Bug opal 2440
OPAL-2440 - informed user what Opal's current encoding is.
OPAL-2440 - spelling correction
Merge pull request #547 from kazoompa/bug-OPAL-2440

OPAL-2440 - informed user what Opal's current encoding is.
Work on OPAL-2448: MySQLIntegrityConstraintViolationException: Duplicate entry 'opal-keys'
Get Hibernate CacheManager from ApplicationContext
Work on OPAL-2448
Upgrade Hibernate & Spring (OPAL-2448)