Updated CLR dependencies

samples/HelloWorld/project.json

@@ -12,8 +12,8 @@
             "System.Globalization": "4.0.10.0",
             "System.IO" : "4.0.0.0",
             "System.Runtime" : "4.0.20.0",
-            "System.Threading.Tasks": "4.0.0.0",
-            "System.Text.Encoding": "4.0.10.0"
+            "System.Threading.Tasks": "4.0.10.0",
+            "System.Text.Encoding": "4.0.20.0"
         }
     }
   }

src/Microsoft.AspNet.Server.WebListener/project.json

@@ -36,7 +36,7 @@
         "System.Text.Encoding.Extensions": "4.0.10.0",
         "System.Threading": "4.0.0.0",
         "System.Threading.Overlapped": "4.0.0.0",
-        "System.Threading.Tasks": "4.0.0.0",
+        "System.Threading.Tasks": "4.0.10.0",
         "System.Threading.ThreadPool": "4.0.10.0"
       }
     }