Caching added + Some server make rules

.gitmodules

 [submodule "task"]
 	path = task
 	url = https://git.mount-mockery.de/pylib/task
+[submodule "caching"]
+	path = caching
+	url = https://git.mount-mockery.de/pylib/caching

Makefile

 		make -C $@/_examples_ all; \
 	fi
 	@echo "   $@.rst" >> index.rst; \
+
+update:
+	git pull
+	git submodule init
+	git submodule foreach git checkout master
+	git submodule foreach git pull
+
+copy:
+	rsync -av --delete _build/html/ /data/webroot/pylib_docs/
+	chown www-data.www-data -R /data/webroot/pylib_docs/

caching

+Subproject commit 01cf327609fcac0dbddbad4168ae154cf625bbee