Set module.exports to an object rather than set its properties
Create and use MongoClientHelper to abstract database logic out of the resources
Rename variable mongoHelper to databaseHelper to generalize its description
Replace usage of .size with .length
Relocate some code from caller function into an asynchronous callback function...

These lines of code are saying, "everything was successful, we're done"
but they were being run immediately instead of after all of the callbacks have finished
Reword some console.log statements to offer a more accurate trace
Rearrange callback functions to be declared separately rather than inline
Clean up some formatting and remove some console.log debug statements