Handle bluebird promise cancellation

[jaroslav-muller]

No description provided.

[vqvu]

Can you add a note about handling bluebird cancels in the docs for wrapping a promise in a stream (here)? Also, finally can't be used as a property name in this way in ES3 (which we technically support but don't test for right now). You need to changes usages of it to promise['finally'].

[jaroslav-muller]

Done.
I had to disable a eslint rule (for two lines only) as eslint doesn't like finally in the bracket notation.

[vqvu]

Great! Thank you.