Added QueryResultWriter for saving big queries
Added Long type compatibility to the ObjectMap.
Replaced raw types with parameterized types in MongoDBCollection
Added methods FindAndModify and Remove to MongoDBCollection
Added methods for indexes management to MongoDBCollection
MongoDBCollection.findAndModify with default template type T = DBObject
Merge branch 'develop' of github.com:opencb/datastore into develop
core: ObjectMap.getString() bugfix

NullPointerException when objectMap[key] == null.