Fix test failures following port to Python 3.

api/rookeries/main.py

@@ -5,11 +5,11 @@ Package for running Rookeries.
 :license: AGPL v3+
 """
 
-
 import importlib
 
 import flask
 
+
 rookeries_app = flask.Blueprint('rookeries_app', __name__)
 
 
@@ -23,4 +23,6 @@ def register_views():
     for views_modules in rookeries_views:
         importlib.import_module(views_modules)
 
+
 register_views()
+

api/tasks/utils.py

@@ -61,7 +61,7 @@ def environment(environ_modifier):
     if not isinstance(environ_modifier, dict):
         raise ValueError('Provided environment "{}" is a not a dict!'.format(environ_modifier))
 
-    non_string_keys = [key for key in environ_modifier.keys() if not isinstance(key, basestring)]
+    non_string_keys = [key for key in environ_modifier.keys() if not isinstance(key, str)]
     if non_string_keys:
         raise ValueError('Provided environment contains invalid keys: "{}"!'.format(non_string_keys))