added 2.0.4 CFPropertyList

lib/cfpropertylist/rbCFPropertyList.rb

@@ -55,7 +55,7 @@ module CFPropertyList
 end
 
 dirname = File.dirname(__FILE__)
-require dirname + '/rbCFFormatError.rb'
+require dirname + '/rbCFPlistError.rb'
 require dirname + '/rbCFTypes.rb'
 require dirname + '/rbXMLCFPropertyList.rb'
 require dirname + '/rbBinaryCFPropertyList.rb'
@@ -69,9 +69,12 @@ module CFPropertyList
   #    'a' => ['b','c','d']
   #  }
   #  cftypes = CFPropertyList.guess(x)
+  #
+  # pass optional options hash. Only possible value actually:
+  # :convert_unknown_to_string => true
+  #
+  # cftypes = CFPropertyList.guess(x,:convert_unknown_to_string => true)
   def guess(object, options = {})
-    return if object.nil?
-
     if(object.is_a?(Fixnum) || object.is_a?(Integer)) then
       return CFInteger.new(object)
     elsif(object.is_a?(Float)) then
@@ -103,6 +106,8 @@ module CFPropertyList
       return CFDictionary.new(hsh)
     elsif options[:convert_unknown_to_string]
       return CFString.new(object.to_s)
+    else
+      raise CFTypeError.new("Unknown class #{object.class.to_s}! Try using :convert_unknown_to_string if you want to use unknown object types!")
     end
   end