Cherry pick async-proof changes to callbacks unit test from dev-200 branch
Remove trailing commas
Bump version and update changelog
Doc stubs for when/poll and when/unfold
Docs for when/poll. Started docs for unfold
Revise unfold to use the more typical unspool approach of returning a pair
Docs for when/unfold/list
Almost done with unfold docs
Allow poll interval function to return a promise
Simplify test/poll a bit
Remove focus rocket
Minor cleanup
Add unfold example code
Finish unfold examples and text
Add links to changelog
Update copyright
Update copyright
Remove extra paren in README & CHANGES
louder kudos
Fix doc links