Adding legacy runtime activation to try and fix problem on the build server

http://stackoverflow.com/questions/20111881/failed-to-load-c-module-in-new-appdomain

Author: robdmoore

AzureWebFarm.OctopusDeploy.Tests/app.config

@@ -1,5 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <configuration>
+  <startup useLegacyV2RuntimeActivationPolicy="true">
+    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5"/>
+  </startup>
   <runtime>
     <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
       <dependentAssembly>