minor rev bump

svn path=/branches/v0_91_maint/; revision=5638

Author: cmoad

CHANGELOG

@@ -1,3 +1,6 @@
+===============================================================
+2008-06-22 Released 0.91.4 at revision 5638
+
 2008-06-09 Don't install Enthought.Traits along with matplotlib. For
            matplotlib developers convenience, it can still be
            installed by setting an option in setup.cfg while we figure