Make sure create many works with lean:true. Follow up on #160

[marshallswain]

Follow up work after #160

We need to make sure create is returning the correct type of object whether lean is on or off. @daffl ran into an issue with this.

[ekryski]

@marshallswain what was the issue? Is this still relevant?

[daffl]

Yes. Something like

mongooseService.create([{
  name: 'David'
}, {
  name: 'Eric'
}, {
  name: 'Marshall'
}]);

Might still return Mongoose models (haven't tested it though).