The intention here is to mirror the API of other existing projects, such as
bluebird and q, but to make this
agnostic to the Promise implementation. When adding a new function, try to use the same API as these other libraries,
to make migration to promise-tools easy. You can assume that Promise has any and all functions available
in the ECMAScript 2015 standard.
All source files should run in the latest node.js without any translation using babel. We do use babel to
generate ES5 source files in lib, and this is what gets distributed, but npm run quicktest will attempt to
run tests without involving babel (as bable is quite slow.) Note that all tests are run on the CI server
using babel translated code.