[Custom]: Missing created callback should not prevent other callbacks from being enqueued.
https://www.w3.org/Bugs/Public/show_bug.cgi?id=25142
Merge pull request #9 from dglazkov/missing-created-callback

[Custom]: Missing created callback should not prevent other callbacks
Smooth out wording wrinkles in ES6 algos.
Merge pull request #14 from dglazkov/es6-registry-change

Smooth out wording wrinkles in ES6 algos.