Upsert fails to create document when id provided, throws 404 NOT FOUND

[djorg83]

Bug or feature request

• Bug
• Feature request

Description of feature (or steps to reproduce if bug)

The create portion of upsert does not work if an id is supplied in the data argument.

Sample upsert call

MyModel.upsert({
  myId: 'some-value',
  otherData: 'something'
});

Model definition

{
  "name": "MyModel",
  "base": "PersistedModel",
  "idInjection": true,
  "options": {
    "validateUpsert": true
  },
  "properties": {
    "myId": {
      "type": "string",
      "id": true,
      "required": true
    },
    "otherData": {
      "type": "string"
    }
  },
  "validations": [],
  "relations": {},
  "acls": [],
  "methods": {}
}

Link to sample repo to reproduce issue (if bug)

Expected result

Document should be created if not found by id.

Actual result (if bug)

404 is thrown. Received error message: No instance with id df97cbcd-8246-49ee-9354-599e8fe64e2f found for MyModel

Cause

This commit d5dd8c7 caused the upsert to break.

Additional information (Node.js version, LoopBack version, etc)

loopback-connector-cloudant: 1.2.2
Node Version: 6.0.0

[jannyHou]

Closing since #129 merged