ember-async-image issues

test(helper): Add waitUntilAllAsyncImagesAreLoaded

1

Add test helper to wait until all images are loaded. Also update travis node and npm version so project builds. See updated [README](https://github.com/html-next/ember-async-image/blob/e467e690dbcd500268a0bd0a12e0115bb8c7d35d/README.md#test-helper)

mrloop

[DOCS]: Document the CSS classes dynamically added to <AsyncImage />

The [`imgState` classNameBindings](https://github.com/html-next/ember-async-image/blob/master/addon/components/async-image.js#L36) should be documented on the README page.

hakilebara

Use join instead of run, to avoid infinite rendering errors

When many instances of the async-image component are present simultaneously (our example is an infinite scrolling page of photos), we encountered an "infinite rendering invalidation detected" error. It appears to...

edkeeble