bump version

git-svn-id: https://svn.forked.de/graph-tool/trunk@19 d4600afd-f417-0410-95de-beed9576f240

configure.in

 dnl Process this file with autoconf to produce a configure script.
 
-AC_INIT(graph-tool, 0.9devel)
+AC_INIT(graph-tool, 0.9)
 AC_CONFIG_SRCDIR(src/graph-tool)
 AM_INIT_AUTOMAKE
 AM_PROG_CC_C_O