prepare for next development iteration
rhbz1044768 Prevent accidental shadowing of private JPA callback methods
rhbz1044768 Use correct etag for translated documents
rhbz1044768 Replace MD5 query for ETag with timestamp-based query

The MD5 query used group_concat, which silently truncates after
reaching GROUP_CONCAT_MAX_LEN bytes.
rhbz1044768 Ensure ETag query returns a timestamp
Merge pull request #384 from zanata/rhbz1044768

rhbz1044768 Replace MD5 query for ETag with timestamp-based query