finish previous commit, and change to a more generic name

configure.ac

 AC_INIT([Gajim - A Jabber Instant Messager],
-		[0.12.1.5-hg],[http://trac.gajim.org/],[gajim])
+		[0.12.1.5-dev],[http://trac.gajim.org/],[gajim])
 AC_PREREQ([2.59])
 
 AC_CONFIG_HEADER(config.h)

src/common/defs.py

@@ -27,7 +27,7 @@
 datadir = '../'
 localedir = '../po'
 
-version = '0.12.1.5-hg'
+version = '0.12.1.5-dev'
 
 import sys, os.path
 for base in ('.', 'common'):