Input gets dirty after focus=>blur even when the value was not changed

[ilya-pyatin]

So there is an issue when we focus an input, make it lose focus without changing the value and it gets dirty (gets the "ng-dirty" CSS class etc.). I have reproduced it in Chrome, but it is probably reproducible in all browsers.

I have checked the 1.3.0 version and the input does not get dirty. So it is an issue.