MdCheckbox: valueChanges observable emits new value twice

[udos86]

Bug, feature request, or proposal: Bug

What is the expected behavior?

valueChanges observable of MdCheckbox form control should emit new value only once when corresponding ngModel is updated programmatically

What is the current behavior?

valueChanges observable of MdCheckbox form control emits new value twice corresponding ngModel is updated programmatically

What are the steps to reproduce?

See this plunker: http://plnkr.co/edit/55wf5BxZ1cmHdFgEeu4K?p=preview

Open DevTools console and click test button --> current value is logged twice

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

Performance

[devversion]

This is a known issue and should be fixed with SHA d037ed3. I will check this with your plunker later.

[jelbourn]

Fixed by #551

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