Eliminate the unnecessary is_undefish function
Clarifications/updates to documentation
Improve performance for non-Node 0.11+ platforms
Add object identity information for better diagnostics
Refactor tests and take advantage of object identity for better diagnostics
Move promise resolution to after generation of the promise itself
Optimize the 'then returns promise' scenario
Remove unused variable
Make resolves always occur deferred to make the semantics match other promises
1.4.0