Overlay attachments observable is triggered before the attachment is complete

[alex-okrushko]

Bug, feature request, or proposal:

bug

What is the expected behavior?

Observable should be triggered when the attachment is complete

What is the current behavior?

It's triggered before that

What are the steps to reproduce?

see plunker

Providing a Plunker (or similar) is the best way to get the team to see your issue.
Plunker template: https://goo.gl/DlHd6U

http://embed.plnkr.co/aNgzEWACkFlAzOC0ZyfJ/

What is the use-case or motivation for changing an existing behavior?

Is there anything else we should know?

push .next() to attachments at the end of the attach() method should fix the issue.

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