rename loader

tests/tripal_chado/example_files/pto_colon.obo

@@ -2,15 +2,8 @@ format-version: 1.2
 data-version: releases/2018-03-09
 saved-by: cooperl
 default-namespace: plant_trait_ontology
-import: http://purl.obolibrary.org/obo/po.owl
 import: http://purl.obolibrary.org/obo/to/imports/chebi_import.owl
-import: http://purl.obolibrary.org/obo/to/imports/envo_import.owl
-import: http://purl.obolibrary.org/obo/to/imports/go_import.owl
-import: http://purl.obolibrary.org/obo/to/imports/ncbitaxon_import.owl
-import: http://purl.obolibrary.org/obo/to/imports/pato_import.owl
-import: http://purl.obolibrary.org/obo/to/imports/peco_import.owl
-import: http://purl.obolibrary.org/obo/to/imports/ro_import.owl
-import: http://purl.obolibrary.org/obo/to/patterns/merge_patterns.owl
+
 ontology: to