Should not tick in onSuccess or onError

[phated]

Running into some weird race condition stuff when an error is omitted from within one of our pumpify pipeline - Ref https://github.com/cristianl/testcase-vinyl-bug from gulpjs/gulp#2086 (comment) and mafintosh/end-of-stream#17

[phated]

The asyncRunner is already nextTicked so there shouldn't be a reason to tick these.

[phated]

Looks like this was added to avoid swallowing thrown errors in promises but that might be wrong.