allow directory nested data migration file paths

lib/data_migrate/data_schema.rb

@@ -31,7 +31,7 @@ def migrated
     def versions
       @versions ||= begin
         versions = []
-        Dir.foreach(DataMigrate::DataMigrator.full_migrations_path) do |file|
+        Dir.glob(File.join(DataMigrate::DataMigrator.full_migrations_path, '**', '*.rb')) do |file|
           match_data = DataMigrate::DataMigrator.match(file)
           versions << match_data[1].to_i if match_data
         end

lib/data_migrate/status_service.rb

@@ -52,7 +52,7 @@ def migration_list(db_list)
 
     def migration_files(db_list)
       file_list = []
-      Dir.foreach(File.join(root_folder, DataMigrate.config.data_migrations_path)) do |file|
+      Dir.glob(File.join(root_folder, DataMigrate.config.data_migrations_path, '**', '*.rb')) do |file|
         # only files matching "20091231235959_some_name.rb" pattern
         if match_data = DataMigrate::DataMigrator.match(file)
           status = db_list.delete(match_data[1]) ? "up" : "down"