Added GetInvocationList to System.Delegate (#85)

***NO_CI***

Author: MateuszKlatecki

source/nanoFramework.CoreLibrary/System/AssemblyInfo.cs

@@ -14,4 +14,4 @@
 [assembly: AssemblyProduct("nanoFramework mscorlib")]
 [assembly: AssemblyCopyright("Copyright © nanoFramework Contributors 2017")]
 
-[assembly: AssemblyNativeVersion("100.2.1.0")]
+[assembly: AssemblyNativeVersion("100.2.2.0")]

source/nanoFramework.CoreLibrary/System/Delegate.cs

@@ -54,8 +54,19 @@ public extern MethodInfo Method
         {
             [MethodImpl(MethodImplOptions.InternalCall)]
             get;
-        }
-
+        }
+
+        /// <summary>
+        /// Returns the invocation list of the delegate.
+        /// </summary>
+        /// <returns>
+        /// An array of delegates representing the invocation list of the current delegate.
+        /// </returns>
+        [MethodImpl(MethodImplOptions.InternalCall)]
+#pragma warning disable S4200 // Native methods should be wrapped
+        public virtual extern Delegate[] GetInvocationList();
+#pragma warning restore S4200 // Native methods should be wrapped
+
         /// <summary>
         /// Gets the class instance on which the current delegate invokes the instance method.
         /// </summary>