Confusing API / Missing documentation: run() resolves even if deferFn is rejected

[0xR]

My deferFn is rejected, however my run() call is resolved. Run() returns the Error which caused the rejection. This means that I have to check whether response is valid or an Error.

What I expect is the run() call to reject when deferFn rejects.

[ghengeveld]

See #47

This is a work in progress.

[ghengeveld]

Closing in favor of #79. Docs have been updated to clearly indicate run returns a promise that always fulfills.