rename "weed watch" to "weed filer.meta.tail"

weed/command/command.go

@@ -16,6 +16,7 @@ var Commands = []*Command{
 	cmdExport,
 	cmdFiler,
 	cmdFilerCat,
+	cmdFilerMetaTail,
 	cmdFilerReplicate,
 	cmdFilerSynchronize,
 	cmdFix,
@@ -26,7 +27,6 @@ var Commands = []*Command{
 	cmdScaffold,
 	cmdServer,
 	cmdShell,
-	cmdWatch,
 	cmdUpload,
 	cmdVersion,
 	cmdVolume,