* Most web.xml servlet API versions updated to 3.0 for ASYNC support
* httpsession-xml is left at 2.5 to ensure compatability & remove ASYNC
* Remove @Override on interface override
This commit provides implementation of SessionRepository based
on Spring's JdbcOperations interface.
@EnableJdbcHttpSession annotation is provided to ease the
configuration, together with spring-session-jdbc BOM and schema
creation scripts for all major databases.
Fixes gh-364
