Bump version to 1.17.8

debian/changelog

@@ -1,3 +1,9 @@
+dpkg (1.17.8) UNRELEASED; urgency=low
+
+  *
+
+ -- Guillem Jover <guillem@debian.org>  Mon, 21 Apr 2014 17:59:10 +0200
+
 dpkg (1.17.7) unstable; urgency=low
 
   [ Guillem Jover ]