added mapping to emby and plex nodes

added ability to override server/token/mapping for emby/plex nodes

Plex/Tests/PlexTests.cs

@@ -33,6 +33,24 @@ public class PlexTests
         var node = new PlexUpdater();
         Assert.AreEqual(2, node.Execute(args));
     }
+
+    [TestMethod]
+    public void Plex_Mapping()
+    {
+        var args = new NodeParameters(@"/mnt/movies/Citizen Kane (1941)/Citizen Kane (1941).mp4", new TestLogger(), false, string.Empty);
+        var settings = new PluginSettings();
+        settings.Mapping = new List<KeyValuePair<string, string>>();
+        settings.Mapping.Add(new KeyValuePair<string, string>("/mnt/movies", "/media/movies"));
+
+        args.GetPluginSettingsJson = (string input) =>
+        {
+            return File.ReadAllText("../../../settings.json");
+        };
+
+        var node = new PlexUpdater();
+        Assert.AreEqual(1, node.Execute(args));
+    }
+
 }
 
 #endif