Support for UTC

[PhilDore11]

We require all our times to display in UTC.
Would it be possible to add support for ng-model-options="{timezone: 'utc'}"

[adripanico]

Actually, it will be great to have it ready for any timezone.

I really don't why the compatibility with Moment was removed, since this would make this task easy peasy.

I will take a look into this.