rewrite tutorial docs and example

tox.ini

@@ -31,9 +31,7 @@ deps =
 
 commands =
     # the examples need to be installed to test successfully
-    pip install -e examples/flaskr -q
-    pip install -e examples/minitwit -q
-    pip install -e examples/patterns/largerapp -q
+    pip install -e examples/tutorial -q
 
     # pytest-cov doesn't seem to play nice with -p
     coverage run -p -m pytest tests examples