Angular: Form / Input .valueChanges fires unexpectedly

[robwormald]

When binding to form inputs' valueChanges observable, methods attached to elements will trigger valueChanges to fire unexpectedly.

Reproduction: http://plnkr.co/edit/aBvtMSfBsSZcAH83GUjN?p=preview
Steps:

• Type in input box, observe valueChanges observable logging values (expected).
• Click button (which is outside of form) - observe observable logging values (unexpected)

cc @vsavkin

[Gallopaway]

This issue still exists when you use md-input

[dgroh]

this issue still exists when using <input type='number'>

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