Moving back to plugin cache for ActiveRecord

This simplifies the code a lot and fixes the issues with date and time
colummns when using the plugin parser.

Add appraisals for all rails 3 versions

lib/validates_timeliness/orm/active_record.rb

@@ -3,19 +3,6 @@ module ValidatesTimeliness
     module ActiveRecord
       extend ActiveSupport::Concern
 
-      def self.use_plugin_cache?
-        ::ActiveRecord::VERSION::STRING < '3.1.0'
-      end
-
-      included do
-        if ValidatesTimeliness::ORM::ActiveRecord.use_plugin_cache? 
-          include Reload
-        else
-          # Just use the built-in before_type_cast retrieval
-          alias_method :_timeliness_raw_value_for, :read_attribute_before_type_cast
-        end
-      end
-
       module ClassMethods
         public
 
@@ -36,34 +23,12 @@ module ValidatesTimeliness
 
         def define_attribute_methods
           super.tap do |attribute_methods_generated|
-            use_before_type_cast = ValidatesTimeliness::ORM::ActiveRecord.use_plugin_cache?
-            define_timeliness_methods use_before_type_cast
+            define_timeliness_methods true
           end
         end
 
         protected
 
-        def define_attribute_timeliness_methods(attr_name, before_type_cast=false)
-          if before_type_cast
-            define_timeliness_write_method(attr_name)
-            define_timeliness_before_type_cast_method(attr_name)
-          elsif ValidatesTimeliness.use_plugin_parser
-            define_timeliness_write_method_without_cache(attr_name)
-          end
-        end
-
-        def define_timeliness_write_method_without_cache(attr_name)
-          method_body, line = <<-EOV, __LINE__ + 1
-            def #{attr_name}=(value)
-              original_value = value
-              if value.is_a?(String)\n#{timeliness_type_cast_code(attr_name, 'value')}\nend
-              super(value)
-              @attributes['#{attr_name}'] = original_value
-            end
-          EOV
-          generated_timeliness_methods.module_eval(method_body, __FILE__, line)
-        end
-
         def timeliness_type_cast_code(attr_name, var_name)
           type = timeliness_attribute_type(attr_name)
 
@@ -73,11 +38,9 @@ module ValidatesTimeliness
         end
       end
 
-      module Reload
-        def reload(*args)
-          _clear_timeliness_cache
-          super
-        end
+      def reload(*args)
+        _clear_timeliness_cache
+        super
       end
 
     end