Moves largerapp into patterns dir and add test

- also adds this pattern into tox for testing

examples/patterns/largerapp/tests/test_largerapp.py

@@ -0,0 +1,12 @@
+from yourapplication import app
+import pytest
+
+@pytest.fixture
+def client(request):
+    app.config['TESTING'] = True
+    client = app.test_client()
+    return client
+
+def test_index(client):
+    rv = client.get('/')
+    assert b"Hello World!" in rv.data