Pass promise library through to DB function

[RovingCodeMonkey]

If the library is not properly passed, the underlying function attempts to use es-6 promises instead.
As I am not using that particular package, it crashes my app.

[christkv]

can you provide a failing test to go with this.

[RovingCodeMonkey]

Providing a failing test is proving much more challenging than I anticipated.

The last test of the promises_db_tests.js comes closest.
Instantiating the connection and passing in the Bluebird promise library is exactly the functionality I was using.

As the initial instantiation of the DB which does not pass through the promise library seems to be a pre-flight run, before calling another instantiation (which does pass it through properly)

Under these conditions that test would fail.

Older version of node (So that global.Promise is undefined) I am uncertain of the exact version our Azure cloud was running, approximately 0.10.x

Es-6 promise library has not been included in the solution.

Since upgrading the version of Node on the server the issue no longer exists.

In the grand scheme of things unlikely to affect many people as long as they are running the new versions, or using the es-6 library.