added command-line option --paginate_path

bin/jekyll

@@ -113,6 +113,16 @@ opts = OptionParser.new do |opts|
     end
   end
 
+  opts.on("--paginate_path [PAGINATED_URL_FORMAT]", "Leave blank for /page<num>") do |paginate_path|
+    begin
+      options['paginate_path'] = paginate_path
+      raise ArgumentError if options['paginate_path'].nil?
+    rescue
+      puts 'You must specify a pagination url format'
+      exit 0
+    end
+  end
+
   opts.on("--limit_posts [MAX_POSTS]", "Limit the number of posts to publish") do |limit_posts|
     begin
       options['limit_posts'] = limit_posts.to_i