pgit.sh: Add branch command to pgit.sh

Signed-off-by: Jan Lindemann <jan@janware.com>

scripts/pgit.sh

@@ -60,6 +60,17 @@ pull()
 	done
 )}
 
+branch()
+{(
+	local d
+	config
+	cd $pdir
+	for d in $pdirs; do
+		marker "$d"
+		(cd $d; git branch "$@")
+	done
+)}
+
 diff()
 {(
 	local d