Adding GAE standard hello world sample (#370)

appengine/standard/hello_world/app.yaml

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+runtime: python27
+api_version: 1
+threadsafe: true
+
+handlers:
+- url: /.*
+  script: helloworld.app

appengine/standard/hello_world/main.py

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+# Copyright 2016 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import webapp2
+
+
+class MainPage(webapp2.RequestHandler):
+    def get(self):
+        self.response.headers['Content-Type'] = 'text/plain'
+        self.response.write('Hello, World!')
+
+app = webapp2.WSGIApplication([
+    ('/', MainPage),
+], debug=True)

appengine/standard/hello_world/main_test.py

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+# Copyright 2016 Google Inc. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import main
+import webtest
+
+
+def test_get():
+    app = webtest.TestApp(main.app)
+
+    response = app.get('/')
+
+    assert response.status_int == 200
+    assert response.body == 'Hello, World!'