v0.8.0

• Pairing with Matryoshka v.0.8.0.
• Improved ActiveRecordCriteria empty _id handling
• Hydrator strategies now use NullableStrategyInterface
• Improved MongoCollectionMockProxy for tests
• [BC] Deprecationg "saveOptions" in favor of "mongoOptions"
• [BC] Forced "justOne" options for isolatedRemove