BugFix: Update and added caching to module list

Makefile

@@ -7,6 +7,7 @@ SPHINXBUILD   = sphinx-build
 SOURCEDIR     = .
 BUILDDIR      = _build
 MODULES       = $(sort \
+    caching\
     socket_protocol\
     state_machine\
     stringtools\
@@ -55,6 +56,7 @@ index.rst: Makefile
 update:
 	git pull
 	git submodule init
+	git submodule update
 	git submodule foreach git checkout master
 	git submodule foreach git pull