Async suffix required for all asynchronous methods

[jbienzms]

According to Asynchronous Programming with async and await:

"By convention, you append "Async" to the names of methods that have an async modifier."

I do not see any asynchronous methods that return Task in this library named with the "Async" suffix.

[hpsin]

Thanks Jared,
This would constitute a breaking change to the library, which is hard to justify usually. We're still pre-1.0 release, but given the amount written with the library thus far and that this is only a convention, I don't feel it's a worthwhile breaking change.

I'm curious to see what other folks' feelings are on this, so I'll leave this open and request that they weigh in.

[hpsin]

After discussion, we should do the breaking change before the 1.0 release. Investigating.

[hpsin]

Fixed by #188