added a listener to handle onBackPressed event directly from Dialog #320
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navasmdc/MaterialDesign Dialog widget does not currently provide a way to handle an OS key back press when Dialog is focusable. This is primarily important when there are are other MaterialDesign views that won't be able to reset if the Dialog is dismissed on an onBackPressed event instead of
The extra listener added allows library users to implement a back press for proper MaterialDesign behaviour.