Only load .yml files in sub-directories

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@3685 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/lib/active_record/fixtures.rb

@@ -292,7 +292,7 @@ def read_fixture_files
         # YAML fixtures
         begin
           yaml_string = ""
-          Dir["#{@fixture_path}/**/*"].select {|f| test(?f,f) }.each do |subfixture_path|
+          Dir["#{@fixture_path}/**/*.yml"].select {|f| test(?f,f) }.each do |subfixture_path|
             yaml_string << IO.read(subfixture_path)
           end
           yaml_string << IO.read(yaml_file_path)