allow local packages in FLASK_APP

don't require .py extension in FLASK_APP
add tests for nested package loading
parametrize cli loading tests

tests/test_apps/cliapp/factory.py

@@ -4,12 +4,12 @@ from flask import Flask
 
 
 def create_app():
-    return Flask('create_app')
+    return Flask('app')
 
 
 def create_app2(foo, bar):
-    return Flask("_".join(['create_app2', foo, bar]))
+    return Flask('_'.join(['app2', foo, bar]))
 
 
-def create_app3(foo, bar, script_info):
-    return Flask("_".join(['create_app3', foo, bar]))
+def create_app3(foo, script_info):
+    return Flask('_'.join(['app3', foo, script_info.data['test']]))

tests/test_apps/cliapp/inner1/__init__.py

@@ -0,0 +1,3 @@
+from flask import Flask
+
+application = Flask(__name__)

tests/test_apps/cliapp/inner1/inner2/flask.py

@@ -0,0 +1,3 @@
+from flask import Flask
+
+app = Flask(__name__)

tests/test_apps/cliapp/message.txt

@@ -0,0 +1 @@
+So long, and thanks for all the fish.