Updated Maven repository URL

  * The old one still works, this doesn't print so many warnings
[core-api] Added utility "withTransaction" methods that are useful for Java 8
[DSI Releaser] prepare release v2.4.1
Merge branch 'release/2.4.1' into develop
[DSI Releaser] prepare for next development iteration
[jvstm-ojb] Removed IdInternal, OID is now the primary key.