Create working demo (#5)

* Add docs example and update demo source code

* Fail with debug

* Fix tests

* Update sql scripts

* Update docs

* Add checking for the password

* Update documentation with launch/usage example

* Launch flake8 instead of pep8 and pyflakes

aiohttp_security/cookies_identity.py

@@ -1,4 +1,4 @@
-"""Identity polocy for storing info directly into HTTP cookie.
+"""Identity policy for storing info directly into HTTP cookie.
 
 Use mostly for demonstration purposes, SessionIdentityPolicy is much
 more handy.

aiohttp_security/session_identity.py

@@ -1,7 +1,7 @@
 """Identity policy for storing info into aiohttp_session session.
 
 aiohttp_session.setup() should be called on application initialization
-to conffigure aiohttp_session properly.
+to configure aiohttp_session properly.
 """
 
 import asyncio