make sure makefile commands can handle spaces in article titles

Makefile

@@ -10,13 +10,15 @@ preview:
 add_article:
 	@echo "Enter Article Title: "
 	@read title;\
-	mkdir -p contents/is/writing/about/$$title;\
-	cat base.md | sed s/{title}/$$title/g | sed s/{date}/`date "+%Y-%m-%d"`/g> contents/is/writing/about/$$title/index.md;\
-	emacs contents/is/writing/about/$$title/index.md
+	dir=`echo $$title | sed "s/ /-/g"`;\
+	mkdir -p contents/is/writing/about/$$dir;\
+	cat base.md | sed "s/{title}/$$title/g" | sed s/{date}/`date "+%Y-%m-%d"`/g> contents/is/writing/about/$$dir/index.md;\
+	emacs contents/is/writing/about/$$dir/index.md
 
 remove_article:
 	@echo "Enter Article Title: "
 	@read title;\
-	rm -rf contents/is/writing/about/$$title
+	dir=`echo $$title | sed "s/ /-/g"`;\
+	rm -rf contents/is/writing/about/$$dir
 
 .PHONY: build clean preview add_article remove_article