update read_layouts with better code

lib/autoblog/site.rb

@@ -18,13 +18,13 @@ module AutoBlog
     
     def read_layouts
       base = File.join(self.source, "_layouts")
-      dir = Dir.new(base)
-      dir.each do |f|
-        unless %w{. ..}.include?(f)
+      entries = Dir.entries(base)
+      entries = entries.reject { |e| File.directory?(e) }
+      
+      entries.each do |f|
         name = f.split(".")[0..-2].join(".")
         self.layouts[name] = File.read(File.join(base, f))
       end
-      end
     rescue Errno::ENOENT => e
       # ignore missing layout dir
     end