[feature request] Make the created Ember app easily available in the console.

[givanse]

Make the created Ember app easily available in the console so that something like this can be done:

twiddle.__container__.lookup('component:my-component').callMethod();

[Gaurav0]

Perhaps include ember-export-application-global by default once addons are working well?

[Gaurav0]

Concrete steps to get this working in Chrome using ember-twiddle 0.10.1+:

1. Add ember-export-application-global addon to twiddle.json
2. Open developer tools
3. Select the dummy-content-iframe in the frame selector dropdown
4. Use the "twiddle" global

While (1) could theoretically be made easier by making the ember-export-application-global addon included by default, (2) and (3) cannot be automated and (4) is not easily discoverable.