Move org-timestamps directory to project

I prefer keeping everything local so nothing can interfere with one another.

.gitignore

@@ -1,3 +1,4 @@
 /.cask
 /public
+/.org-timestamps
 /posts/index.org*

GNUmakefile

@@ -15,4 +15,4 @@ clean:
 	@echo "Cleaning up..."
 	@rm -rvf *.elc
 	@rm -rvf public
-	@rm -rvf ~/.org-timestamps/*
+	@rm -rvf .org-timestamps

publish.el

@@ -84,6 +84,9 @@ STYLE is ignored and PROJECT is passed on directly to related functions."
 
 (setq org-html-htmlize-output-type 'css)
 
+(setq org-publish-timestamp-directory
+      (concat default-directory "/.org-timestamps/"))
+
 (setq org-publish-project-alist
       '(("posts"
          :base-directory "posts/"