Removed CMS RC retrieval from nightly feed.

Author: AndyButland

NuGet.config

@@ -11,11 +11,9 @@
       <package pattern="*" />
     </packageSource>
     <packageSource key="Umbraco Prereleases">
-      <package pattern="Umbraco.Cms.*" />
       <package pattern="Umbraco.Deploy.*" />
     </packageSource>
-  <packageSource key="Umbraco Nightly">
-      <package pattern="Umbraco.Cms.*" />
+    <packageSource key="Umbraco Nightly">
       <package pattern="Umbraco.Deploy.*" />
     </packageSource>
   </packageSourceMapping>