Fix nunit config file to force running in .NET 4.0

--HG--
branch : dev

lib/nunit/nunit.exe.config

@@ -1,5 +1,12 @@
 <?xml version="1.0" encoding="Windows-1252"?>
 <configuration>
+  <!-- Needed for .NET 4.0 support and SQLite
+       see http://www.meadow.se/wordpress/?p=393 -->
+  <startup useLegacyV2RuntimeActivationPolicy="true">
+    <supportedRuntime version="v4.0"/>
+    <requiredRuntime version="v4.0.30319" />
+  </startup>
+
   <!--
      Application settings for NUnit-gui.exe. Do NOT put settings
 	 for use by your tests here.
@@ -28,6 +35,7 @@
 	</system.diagnostics>
 
   <runtime>
+    <loadFromRemoteSources enabled="true" />
     <!-- We need this so test exceptions don't crash NUnit -->
     <legacyUnhandledExceptionPolicy enabled="1" />