Suggest add user-select: none to [button-toggle]

[colinfang]

Since button-toggle appears like buttons, I suggest user-select should be disabled. (Maybe in .md-button-toggle-label-content)

        -webkit-user-select: none;
        -moz-user-select: none;
        -ms-user-select: none;
        user-select: none;

[fxck]

Is this really needed? The default value for actual button element is user-select: text, in desktop browser anyway, is it any different in mobile browsers? Also is this really needed, what action should it prevent?

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