Polish up examples (somewhat)

- Mention them in the docs (arguably a bit hamfistedly).
- Make the README an RST.
- Make them pass flake8 and add flake8 to tox.ini

They should all be rewritten and made Python 3-friendly but that's out
of scope here.
diff --git a/examples/README.rst b/examples/README.rst
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index 0000000..1e9116b
--- /dev/null
+++ b/examples/README.rst
@@ -0,0 +1,56 @@
+========
+Examples
+========
+
+
+certgen.py -- Certificate generation module
+===========================================
+
+Example module with three functions:
+
+createKeyPair
+   Create a public/private key pair.
+
+createCertRequest
+   Create a certificate request.
+
+createCertificate
+   Create a certificate given a cert request.
+
+In fact, I created the certificates and keys in the 'simple' directory with the script ``mk_simple_certs.py``.
+
+
+simple -- Simple client/server example
+======================================
+
+Start the server with::
+
+    python server.py PORT
+
+and start clients with::
+
+    python client.py HOST PORT
+
+The server is a simple echo server, anything a client sends, it sends back.
+
+
+proxy.py -- Example of an SSL-enabled proxy
+===========================================
+
+The proxy example demonstrate how to use set_connect_state to start talking SSL over an already connected socket.
+
+Usage::
+
+  python proxy.py server[:port] proxy[:port]
+
+Contributed by Mihai Ibanescu
+
+
+SecureXMLRPCServer.py -- SSL-enabled version of SimpleXMLRPCServer
+==================================================================
+
+Acts exactly like `SimpleXMLRPCServer <https://docs.python.org/3/library/xmlrpc.server.html>`_ from the Python standard library, but uses secure connections.
+The technique and classes should work for any SocketServer style server.
+However, the code has not been extensively tested.
+
+Contributed by Michal Wallace