2014-01-22: Added automatic ChangeLog generation.

Added automatic ChangeLog generation.

diff --git a/Makefile.am b/Makefile.am
--- a/Makefile.am
+++ b/Makefile.am
@@ -4,7 +4,10 @@ EXTRA_DIST = $(wisp_SOURCES) $(wisp_DATA
 CLEANFILES = ${wisp} 
 DISTCLEANFILES = ${CLEANFILES} @abs_top_builddir@/1 @abs_top_builddir@/2 @abs_top_builddir@/test.sh
 
-all : ${wisp} $(changelog)
+all : ${wisp}
+
+ChangeLog :
+	hg log --style changelog > ChangeLog
 
 # emacs org-mode beamer build instructions
 ${wisp} : input.in.intermediate