Merge branch 'master' into muxtestinfra

Author: Rosuavio

Microsoft.Toolkit.Uwp.SampleApp/Pages/SampleController.xaml

@@ -50,13 +50,12 @@
                         Margin="5,0,0,0"
                         Width="50">
                         <AppBarButton.Icon>
-                            <PathIcon
-                                Data="{StaticResource GithubIcon}"
-                                Width="50"
-                                Height="50"
-                                Margin="-10">
+                            <PathIcon Margin="-3" 
+                                VerticalAlignment="Center"
+                                HorizontalAlignment="Center"
+                                Data="{StaticResource GithubIcon}">
                                 <PathIcon.RenderTransform>
-                                    <CompositeTransform TranslateY="8" TranslateX="3" />
+                                    <CompositeTransform TranslateY="5" TranslateX="-5" />
                                 </PathIcon.RenderTransform>
                             </PathIcon>
                         </AppBarButton.Icon>