added ondras/promise
Add ff to implementations list.
Adding D.js to implementations list.
Update Covenant's description.

It's no longer ~60 lines :).
Consistently use "reason" rather than "rejection reason". See #80
Similarly, use "value" instead of "fulfillment value". thanks @domenic
Add Shvua to list of implementations.
Handle thenables that fulfill with themselves.

Without this change, thenables that fulfill with themselves would cause an infinite loop in the spec algorithm. Real-world examples of this include far references from Q (i.e. where the promise represents a reference to a remote object), or promise-entities from Ember.js.

Thanks to @erights for discovering this.
Allow vicious cycle detection.
Mandate `[[Resolve]](p, p)` to throw a `TypeError`.
Add more implementations!

Includes Local.js Promises, Promix, and xogeny/aplus (a Python implementation!).
Encourage usage of the "promises-aplus" keyword.
Add link to FidPromise implementation.
Add Core to list of Promises/A+ implementations
Adds nbd.js as a conforming implementation

nbd.js implements Promise/A+ as an inheritable trait that can be used with its Class.mixin() to make every instance of that class .then()able.

In addition, it also provides a .promise() that allows it to work with jQuery's $.when().
Add YUI to the list of implementations
Add Pacta to implementations.
Add @domenic as co-editor
Merge pull request #123 from briancavalier/add-domenic-as-coeditor

Add @domenic as co-editor
Update YUI link as per @juandopazo's request.

See https://github.com/promises-aplus/promises-spec/pull/121#issuecomment-18807162.