Improve quvi 0.4 output parsing to handle cases wher there is no known filename extension. This is currently the case when using quvi with youtube. In this case, the extension ".m" will be used.

Command/ImportFeed.hs

@@ -196,7 +196,7 @@ performDownload opts cache todownload = case location todownload of
 					Just link -> do
 						let videourl = Quvi.linkUrl link
 						checkknown videourl $
-							rundownload videourl ("." ++ Quvi.linkSuffix link) $ \f ->
+							rundownload videourl ("." ++ fromMaybe "m" (Quvi.linkSuffix link)) $ \f ->
 								maybeToList <$> addUrlFileQuvi (relaxedOpt opts) quviurl videourl f
 #else
 		return False