fixed duplicate elements bug

lib/microformats2.rb

@@ -10,9 +10,12 @@ module Microformats2
   def self.parse(html)
     raise LoadError, "argument must be a String or File" unless [String, File].include?(html.class)
 
+    html = html.read if IO === html
+
     doc = Nokogiri::HTML(html)
     microformats = Hash.new{|hash, key| hash[key] = Array.new}
-    doc.css("*[class^=h-]").each do |microformat|
+
+    doc.css("*[class|=h]").each do |microformat|
       constant_name = classify(microformat.attribute("class").to_s.gsub("-","_"))
 
       if Object.const_defined?(constant_name)
@@ -33,7 +36,7 @@ module Microformats2
       microformats[constant_name.downcase.to_sym] << obj
     end
 
-    return microformats
+    microformats
   end
 
   def self.add_method(obj, method_name)