Added new method and return encoding

doc_src/tx.rb

@@ -301,6 +301,12 @@ def scan(str, &block)
           yield(key, pos, value)
         end
 
+        # Adds multiple key/value pairs to the index.
+        #
+        # e.g. <tt>builder.add_all(["key1", "value1", "key2", "value2"])</tt>
+        def multiple_add(words)
+          Builder.new.add_all(words)
+        end
     end
 
 end

lib/tx.rb

@@ -50,19 +50,19 @@ def bytesize(str)
         else
 
           def default_encoding
-            return nil
+            Encoding::UTF_8
           end
 
           def add_encoding(obj)
-            return obj
+            obj
           end
 
           def to_binary(str)
-            return str
+            str
           end
 
           def bytesize(str)
-            return str.length
+            str.length
           end
 
         end