fix version to use corefx rc2, rc3 is wrong and not yet published

Author: enricosada

src/fsharp/FSharp.Compiler.Service.ProjectCracker.netcore/NuGet.Config

@@ -2,5 +2,8 @@
 <configuration>
   <packageSources>
     <add key="fsharp-daily" value="https://www.myget.org/F/fsharp-daily/api/v3/index.json" />
+    <!-- MSBuild -->
+    <add key="dotnet-buildtools" value="https://dotnet.myget.org/F/dotnet-buildtools/api/v3/index.json" />
+
   </packageSources>
 </configuration>

src/fsharp/FSharp.Compiler.Service.ProjectCracker.netcore/project.json

@@ -51,10 +51,10 @@
       "type": "platform",
       "version": "1.0.0-rc2-3002702"
     },
-    "Microsoft.Build": "0.1.0-preview-*",
-    "Microsoft.Build.Framework": "0.1.0-preview-*",
-    "Microsoft.Build.Tasks.Core": "0.1.0-preview-*",
-    "Microsoft.Build.Utilities.Core": "0.1.0-preview-*",
+    "Microsoft.Build": "0.1.0-preview-00022",
+    "Microsoft.Build.Framework": "0.1.0-preview-00022",
+    "Microsoft.Build.Tasks.Core": "0.1.0-preview-00022",
+    "Microsoft.Build.Utilities.Core": "0.1.0-preview-00022",
     "System.Runtime.Serialization.Json": "4.0.2-rc2-*",
     "Microsoft.FSharp.Core.netcore": "1.0.0-alpha-*",
     "FSharp.Compiler.Service.netcore": "1.0.0-alpha-*",