Add pylint running capability

Makefile

@@ -1,8 +1,20 @@
 APPENDCOV = $(shell test -s test_rerun.txt && echo "-a")
+MODULES = duckbook booking api accounts
 
 test:
 	coverage run $(APPENDCOV) \
-	   --source "duckbook,booking,api,accounts" \
+	   --source `echo $(MODULES) | sed 's/ /,/g'` \
 	   manage.py test `cat test_rerun.txt`
 	coverage html
 	coverage report
+	@echo "Coverage data is available in HTML format under the htmlcov directory"
+
+lint:
+	rm -rf pylint
+	pylint --rcfile=.pylintrc $(MODULES) || true
+	mkdir pylint
+	sh -c 'for file in pylint_*; do \
+	    o="$${file#pylint_}"; \
+	    mv "$$file" pylint/$$o; \
+        done'
+	@echo "lint data is available in TXT format under the pylint directory"