Vitor Cortez 90968ce790 Add modifier key option
The `modifier` option allows the Clipboard API to prevent the creation
of a new instance of `ClipboardAction` if the `click` event object is
not fired with a special key pressed.

It basically functions as a new type of event. The keys 'ctrl',
'shift', 'alt' and 'meta' are supported.
2015-11-03 00:18:05 -03:00
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2015-11-03 00:18:05 -03:00