fixes according to review comments

Directory.Build.props

@@ -162,6 +162,7 @@
     <AndroidNamespaceReplacement Include='webkit' Replacement='WebKit' />
     <AndroidNamespaceReplacement Include='poolingcontainer' Replacement='PoolingContainer' />
     <AndroidNamespaceReplacement Include='sessionprocessor' Replacement='SessionProcessor' />
+    <AndroidNamespaceReplacement Include='dev.chrisbanes.snapper' Replacement='Xamarin.Dev.ChrisBanes.Snapper' />
     
   </ItemGroup>
 </Project>

templates/dev-chrisbanes-snapper/External-Dependency-Info.txt

@@ -8,7 +8,7 @@ material are set forth below.  Microsoft reserves all other rights not
 expressly granted, whether by implication, estoppel or otherwise.
 
 ########################################
-# Napier
+# Snapper
 # https://github.com/chrisbanes/snapper/
 ########################################