Upgrade projects and web.config to 4.5 FW

src/Orchard.Web/Web.config

@@ -43,10 +43,17 @@
   <system.transactions>
     <defaultSettings timeout="00:30:00"/>
   </system.transactions>
+  <!--
+    For a description of web.config changes for .NET 4.5 see http://go.microsoft.com/fwlink/?LinkId=235367.
+
+    The following attributes is set on the <httpRuntime> tag: targetFramework="4.5"
+    for more info: http://blogs.msdn.com/b/webdev/archive/2012/11/19/all-about-httpruntime-targetframework.aspx
+    
+  -->
   <system.web>
     <!--<trust level="Medium" originUrl="" />-->
     <!-- Accept file uploads up to 64 Mb -->
-    <httpRuntime requestValidationMode="2.0" maxRequestLength="65536" /> 
+    <httpRuntime targetFramework="4.5" requestValidationMode="2.0" maxRequestLength="65536"/>
     <!-- 
             Set compilation debug="true" to insert debugging 
             symbols into the compiled page. Because this 
@@ -98,7 +105,7 @@
             to be displayed in place of a error stack trace.
     -->
     <customErrors mode="RemoteOnly"/>
-    <pages controlRenderingCompatibilityVersion="3.5" clientIDMode="AutoID">
+    <pages>
       <namespaces>
         <add namespace="System.Web.Mvc"/>
         <add namespace="System.Web.Mvc.Ajax"/>
@@ -110,10 +117,7 @@
       </namespaces>
     </pages>
   </system.web>
-  <!-- 
-        The system.webServer section is required for running ASP.NET AJAX under Internet
-        Information Services 7.0.  It is not necessary for previous version of IIS.
-  -->
+
   <system.webServer>
     <validation validateIntegratedModeConfiguration="false"/>
     <modules runAllManagedModulesForAllRequests="false">
@@ -138,7 +142,7 @@
     <security>
       <requestFiltering>
         <!-- Accept file uploads up to 64 Mb -->
-        <requestLimits maxAllowedContentLength="67108864" />
+        <requestLimits maxAllowedContentLength="67108864"/>
       </requestFiltering>
     </security>
   </system.webServer>