Merge pull request #68 from emorency/master

OPAL-2412: Adding BinaryVariable Summary.
Merge pull request #69 from emorency/master

Setting copyright header
JoinedVectorSource replaced by a value iterator. Remove value from buffer after usage in mongo and hibernate value iterators.
OPAL-2307 Check if table is a view instance
When getting the entities from MongoDB, query only for _id field.
Findbug fix
Upgrade Spring & Hibernate
Change repo order