Setup now installs markdown-lint. Make lint lints.

Makefile

@@ -6,3 +6,9 @@ setup:
 	@cp ./scripts/pre-commit .git/hooks
 	@chmod +x .git/hooks/pre-commit
 	@echo "Git pre-commit hook installed."
+	
+	@gem install mdl --install-dir .gem
+	@echo "Installed required Ruby gems under .gem"
+	
+lint: 
+	@GEM_PATH=.gem PATH=$(PATH):.gem/bin find pages -exec mdl {} --style ./scripts/markdown-style.rb 1>&2 \;