added missing ArgumentMatrixPositiveDefinite to silverlight project

src/Silverlight/Properties/Resources.Designer.cs

@@ -159,6 +159,15 @@ namespace MathNet.Numerics.Properties {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to Matrix must be positive definite..
+        /// </summary>
+        internal static string ArgumentMatrixPositiveDefinite {
+            get {
+                return ResourceManager.GetString("ArgumentMatrixPositiveDefinite", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to Matrix column dimensions must agree..
         /// </summary>

src/Silverlight/Properties/Resources.resx

@@ -288,4 +288,7 @@
   <data name="ProposalDistributionNoUpperBound" xml:space="preserve">
     <value>The sampler's proposal distribution is not upper bounding the target density.</value>
   </data>
+  <data name="ArgumentMatrixPositiveDefinite" xml:space="preserve">
+    <value>Matrix must be positive definite.</value>
+  </data>
 </root>