added $HOME/bin to the path env variable under osx

prelude/prelude-osx.el

@@ -2,7 +2,8 @@
 ;; the shell.
 ;; If you're using homebrew or port, modifying the PATH is essential.
 (let (osx-paths)
-  (dolist (path '("/usr/local/bin" "/opt/local/bin" "/opt/local/sbin") (setenv "PATH" (concat osx-paths (getenv "PATH"))))
+  (dolist (path '("/usr/local/bin" "/opt/local/bin" "/opt/local/sbin" "$HOME/bin")
+                (setenv "PATH" (concat osx-paths (getenv "PATH"))))
     (push path exec-path)
     (setq osx-paths (concat (concat path ":") osx-paths))))