Change output on tick, not bound value

[santtu]

If this is used like {{fromNow valueBinding="createdAt"}} as in the example this will cause the original createdAt to be changed (two-directional binding) because of notifyPropertChange('value').

More info on http://santtu.iki.fi/2013/12/11/gotcha-beware-of-bidir-traffic/.

[jgwhite]

This whole example is kinda out of date now. And actually, the pattern of having a clock service is kinda preferable. Still, good call, thanks for the PR!

[santtu]

Do you mean the cookbook recipe http://emberjs.com/guides/cookbook/working_with_objects/continuous_redrawing_of_views/?

[jgwhite]

@santtu yeah exactly