Merge branch 'fixFlatButtonBorderStyle' of https://github.com/Keboo/MaterialDesignInXamlToolkit into Keboo-fixFlatButtonBorderStyle

Author: ButchersBoy

MaterialDesignThemes.Wpf/Themes/MaterialDesignTheme.Button.xaml

@@ -112,7 +112,7 @@
         <Setter Property="wpf:RippleAssist.Feedback" Value="{DynamicResource MaterialDesignFlatButtonRipple}" />
         <Setter Property="TextBlock.FontWeight" Value="Medium"/>
         <Setter Property="TextBlock.FontSize" Value="14"/>
-        <Setter Property="BorderThickness" Value="1"/>
+        <Setter Property="BorderThickness" Value="0"/>
         <Setter Property="HorizontalContentAlignment" Value="Center"/>
         <Setter Property="VerticalContentAlignment" Value="Center"/>
         <Setter Property="Padding" Value="16 4 16 4"/>
@@ -121,7 +121,8 @@
             <Setter.Value>
                 <ControlTemplate TargetType="{x:Type Button}">
                     <Grid>
-                        <Border Background="{TemplateBinding Background}" x:Name="border" CornerRadius="2">
+                        <Border Background="{TemplateBinding Background}" x:Name="border" CornerRadius="2"
+                                BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">
                             <wpf:Ripple Content="{TemplateBinding Content}" ContentTemplate="{TemplateBinding ContentTemplate}" Focusable="False"    
                                         HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" 
                                         VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"