fixes #628

response.include_files is now cleaner and easier to maintain

You can specify a tuple of (type, url) to include external assets
without extension (such as the usecase described in #628)

Added tests for include_files, that was never included in CI tests

gluon/tests/__init__.py

@@ -4,6 +4,7 @@ from test_http import *
 from test_cache import *
 from test_contenttype import *
 from test_fileutils import *
+from test_globals import *
 from test_html import *
 from test_is_url import *
 from test_languages import *