Added separate test for custom patterns specifying

+ updated History.md

test/liquid/file_system_test.rb

@@ -25,8 +25,9 @@ class FileSystemTest < Test::Unit::TestCase
     assert_raise(FileSystemError) do
       file_system.full_path("/etc/passwd")
     end
+  end
 
-    # custom pattern for template filenames
+  def test_custom_template_filename_patterns
     file_system = Liquid::LocalFileSystem.new("/some/path", "%s.html")
     assert_equal "/some/path/mypartial.html"    , file_system.full_path("mypartial")
     assert_equal "/some/path/dir/mypartial.html", file_system.full_path("dir/mypartial")