Recursive clean in Makefile implemented

Makefile

@@ -29,6 +29,10 @@ html: Makefile
 
 clean: Makefile
 	rm -f *.rst
+	@for module in $(MODULES) ; do \
+		if [ -d "$$module/_examples_" ]; then make --no-print-directory -C $$module/_examples_ clean; fi \
+		#if [-d "$$module/_examples_" ]; then make --no-print-directory -C $$module/_examples_ clean; fi\
+	done
 	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
 
 index.rst: Makefile

state_machine

@@ -1 +1 @@
-Subproject commit 2bd816297527e77fb44a03ddf4aca35124f6f303
+Subproject commit db70e14d4650c9894ee0ff5c5c6078264ce59b46

stringtools

@@ -1 +1 @@
-Subproject commit f5453861f646873b1800e657faa9e4b8684c21ba
+Subproject commit 5ac92e2b864cd27bd4026352ba9149f4d23ca019