[CDRIVER-2612] bson_as_json prints insignificant digits for doubles - MongoDB

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Unfortunately a new number formatting similar to issue: https://jira.mongodb.org/browse/CDRIVER-652. The bson_as_json function prints many insignificant digits for doubles:

> con <- mongo()

> con$insert('{"test": 3.9}')

> con$export()

{ "_id" : { "$oid" : "5ad088a5ba7cb20ff97e6a54" }, "test" : 3.8999999999999999112 }

OTOH, the mongo command line utility prints the correct number of digits for the same data:

> db.test.find()

{ "_id" : ObjectId("5ad088a5ba7cb20ff97e6a54"), "test" : 3.9 }