* New abstraction for NoSql database sources
* New MongoDbSource: partial impl
* Added MongoDataType
* Improved MongoDatabase and fixed read method
* code review changes;
* merge clean up;
* Renamed NoSqlDatabase to AbstractDatabase
* formatter changes;
* code review changes: changed mongodb-new to mongodb-v2; left only new connector info in all docs
* code review changes: changed mongodb-new to mongodb-v2; left only new connector info in all docs
* updated spec.json and toDatabaseConfig() method
* updated doc accordingly to spec.json changes
Co-authored-by: Iryna Kruk <iryna.o.kruk@globallogic.com>