WIP: Context menu item for "Inspect Ember Component"

[thorsteinsson]

This adds "Inspect Ember Component" context menu item to all pages when Ember has been detected. It adds the object id to the query string which keeps the component selected between page refreshes.

Things to improve:

• Add tests.
• Scroll to the selected component in the inspector.
• Show a message when the ember inspector is not visible (tell the user to open the inspector, not possible with code).
• Show a message when a component is not found.

[thorsteinsson]

@Bestra and I paired on this at the Emberconf contributors workshop for #689.

[RobbieTheWagner]

@thorsteinsson @Bestra @nummi does anyone have cycles to help get this over the finish line?

[Bestra]

@rwwagner90 I think I'll have at least a half day to work on it this Friday. @thorsteinsson would you be okay with me adding some commits to your branch if I get the time?

[thorsteinsson]

Of course, go ahead. I've been so busy at work, hoping to get some time tomorrow.

[RobbieTheWagner]

Is anyone actively working on this?

[Bestra]

@rwwagner90 I'd like to close this PR in favor of #843

[Bestra]

@thorsteinsson I'm closing this one in favor of #843, which is essentially this PR with two extra commits from me. Good work!