afollestad/material-dialogs — pull request #131 by plusCubed (2014-12-19 00:02:03+00:00)
Title: Remove state-list animation for action button on 5.0+

In commit 3e8ed207a68be525f0097a94c4c47526acc61fbe, the action buttons were changed to ```Button```s from ```TextView```s.
Due to the default style for buttons, they create shadows when pressed, which is not supposed to happen for flat buttons in a dialog.
This overrides that attribute.