Convert to publish on npm, and bump version number to 0.8.0.

update to version 0.7.0

jshint fixes

Fix native Object.is() detection, fixes #54.

bump version to 0.6.1 so that delite can use changes in #52

Simplify has("ie") detection.

Trident is set for IE8+, so I removed some legacy code that was only needed for IE6-7.

Also, document.documentMode seems to be always set for IE8-11, even
without an x-ua-compatible <meta> tag, but I left in code to check
navigator.appVersion too, just in case it's needed for future
versions of IE.

Add deliver() and discardChanges() methods to Stateful.

Previously they were just in Invalidating.

The new methods call deliver() and discardChanges() on every listener registered via
Stateful#observe().

Invalidating has a minor behavior change: deliver() and discardChanges() now affect every listener
registered via observe(), not just the two listeners registered by Invalidating itself.

Fixes #42.

Change decor version number to 0.6.0.

update to version 0.5.0

get ready to tag 0.5.0-beta