Use 3.0 configuration in RCLs

sample/ApplicationInsightsHostingStartupSample/ApplicationInsightsHostingStartupSample.csproj

@@ -5,8 +5,8 @@
     <RuntimeIdentifiers>win7-x86;win7-x64;linux-x64;osx-x64</RuntimeIdentifiers>
 
     <_EnableAllInclusiveRazorSdk>true</_EnableAllInclusiveRazorSdk>
-    <RazorLangVersion>2.1</RazorLangVersion>
-    <RazorDefaultConfiguration>MVC-2.1</RazorDefaultConfiguration>
+    <RazorLangVersion>3.0</RazorLangVersion>
+    <RazorDefaultConfiguration>MVC-3.0</RazorDefaultConfiguration>
   </PropertyGroup>
 
   <ItemGroup>