async: use three args for addEventListener

The third argument for `addEventListener` and `removeEventListener`
is supposed to be optional, defaulting to `false`, but some browsers
(notably older versions of FireFox) require it.

See https://github.com/thinkpixellab/PxLoader/issues/5 and
https://developer.mozilla.org/en-US/docs/Web/API/EventTarget.removeEventListener

some a+ 1.1 spec fixes.

with a `TypeError' as the reason.

Fix callback assimilation

Run reduce tests only in node

Add multiple resolve test

This was handled for some code paths but not all.

Removed the double try/catch

This allows the VM to optimize correctly.

[fixes #66] Use setImmediate when available, which fixes newer node's

- Node >= 0.10.0 should used setImmediate over nextTick
- prefer argument passing then callback rebinding

fix test load order issue

Move from Rake-based build to Grunt

This function is invoked when an unhandled exception is thrown.

Throw exception in all called without an array

Minor clarification in README on routes re: propagation

The original explanation's 'even though' is misleading, giving you the impression that if the first `.then` included an error handler, the second `.then`'s error handler would have fired, which only the case if the first error handler threw an error or returned RSVP.reject.

Perhaps we'll want another paragraph explaining how to "rethrow" a reject, but for now this should do.

Add CHANGELOG stub

Make `RSVP.denodeify` pass along `thisArg`.

See discussion in #55.