Bump version to 1.17.4

debian/changelog

@@ -1,3 +1,9 @@
+dpkg (1.17.4) UNRELEASED; urgency=low
+
+  *
+
+ -- Guillem Jover <guillem@debian.org>  Thu, 05 Dec 2013 11:08:49 +0100
+
 dpkg (1.17.3) unstable; urgency=low
 
   [ Guillem Jover ]