Fix typo in MongoHelpers
OGM-671 Using MongoDB 2.6.5 for embedded tests
OGM-671 Do not execute empty batch as the MongoDB driver is more strict
OGM-605 Add version + embedded object test
OGM-605 Add test for composite id and bidir many to one structure in mongo
OGM-605 Converted dotted columns into nested DBObject and vice versa

The idea here is to expect a nested structure from the DBObject for
every dot encountered in a column