Add JavaScriptEngineSwitcher v8 config section so ClearScript init doesn't fail

References Taritsyn/JavaScriptEngineSwitcher#12

Author: Daniel15

src/React.Sample.Mvc4/Web.config

@@ -5,6 +5,11 @@
   -->
 
 <configuration>
+	<configSections>
+		<sectionGroup name="jsEngineSwitcher">
+			<section name="v8" type="JavaScriptEngineSwitcher.V8.Configuration.V8Configuration, JavaScriptEngineSwitcher.V8" />
+		</sectionGroup>
+	</configSections>
   <appSettings>
     <add key="webpages:Version" value="2.0.0.0" />
     <add key="webpages:Enabled" value="false" />
@@ -57,4 +62,7 @@
     </assemblyBinding>
   </runtime>
 
+	<jsEngineSwitcher xmlns="http://tempuri.org/JavaScriptEngineSwitcher.Configuration.xsd">
+	</jsEngineSwitcher>
+
 </configuration>