Use bluebird promise library instead of global.Promise

[mrfelton]

Bug or feature request

• Bug
• Feature request

Description of feature (or steps to reproduce if bug)

Loopback 3.x no longer relies on global.Promise and instead explicitly uses bluebird for promises. This module should follow suit for better compatibility with loopback 3.x where bluebird is used extensively and many users will not have global.Promise set (this is no longer recommended.

The current situation is that if you don't have global.Promise set, you end up with native es6 promises being returned by this modules methods which are not particularly good to work with and can cause unexpected issues when users try to use bluebird methods on them as they would with the rest of their loopback code.

[stale]

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[stale]

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