Db2Dialect added in order to support DB2.
Added test configuration files.
Adapted some tests to make them properly work with DB2
QueryAnnotationIntegrationTests converted into an Hsqldb only test since it is next to impossible to make it work across databases since it heavily depends on database and driver specifics.
Removed license acceptance file from the repository in order to not accept a license in the name of someone forking the repository.
For the CI build an appropriate file gets created on the fly.
Original pull request: #213.
