Add env to atom component

[knownasilya]

This allows the component to control things like env.save(value, payload) to trigger a rerender of the atom or to handle teardown.

[knownasilya]

Ping

[bantic]

@knownasilya Sorry for the delay. Thanks for submitting. I don't think we had previously considered that the cards or atoms in a mobiledoc would remain "live" after rendered by ember-mobiledoc-dom-renderer. I am pleasantly surprised that this works. :)
Are you wanting to call env.save so that you can update the mobiledoc JSON output? And/or is there a reason that you couldn't modify the Ember component's properties to effect a change in the rendered template? That was more the expectation for this dom renderer.

[palcisto]

@knownasilya @bantic Could this PR be modified to also pass the env to the card component? I am in a situation where I am trying to leverage env.isInEditor in my Card component per the mobledoc Card API. Or would it be better to create a new PR to add that functionality?

[knownasilya]

@bantic it was to save the json of the atom.