Merge pull request #224 from bjeanes/force-priority-for-nzbget

Added Force priority for NZBGet

src/NzbDrone.Core/Download/Clients/Nzbget/NzbgetPriority.cs

@@ -6,6 +6,7 @@
         Low = -50,
         Normal = 0,
         High = 50,
-        VeryHigh = 100
+        VeryHigh = 100,
+        Force = 900
     }
-}
+}