Consider adding Object iteration support for Deft.Promise::all(), any(), map() and reduce()

[johnyanarella]

when.js recently added this feature in a development branch.

Ongoing discussion of that enhancement to when.js can be found here: cujojs/when#30

See also: https://github.com/cujojs/when/blob/object-properties/when.js

Might be worth adding similar support to Deft JS Promises.