[OPENENGSB-3782] Make QueryRequest serializable
[OPENENGSB-3783] Implement hashCode and equals for QueryRequest
[OPENENGSB-3753] Make CommitMetaInfo serializable
[OPENENGSB-3783] Fix checkstyle errors in QueryRequest
Merge pull request #903 from thrau/master

Make CommitMetaInfo and QueryRequest usable for display models