Rake task new_post now accepts titles through stdin

This should help resolve issues for zsh users and make it easier to enter titles which freak out Rake's argument processing

Rakefile

@@ -92,10 +92,13 @@ end
 # usage rake new_post[my-new-post] or rake new_post['my new post'] or rake new_post (defaults to "new-post")
 desc "Begin a new post in #{source_dir}/#{posts_dir}"
 task :new_post, :title do |t, args|
+  if args.title
+    title = args.title
+  else
+    title = get_stdin("Enter a title for your post: ")
+  end
   raise "### You haven't set anything up yet. First run `rake install` to set up an Octopress theme." unless File.directory?(source_dir)
   mkdir_p "#{source_dir}/#{posts_dir}"
-  args.with_defaults(:title => 'new-post')
-  title = args.title
   filename = "#{source_dir}/#{posts_dir}/#{Time.now.strftime('%Y-%m-%d')}-#{title.to_url}.#{new_post_ext}"
   if File.exist?(filename)
     abort("rake aborted!") if ask("#{filename} already exists. Do you want to overwrite?", ['y', 'n']) == 'n'