Added baseline for sphinx documentation and on2FACode event

The docs are still very WIP, but they should be functional. Just
execute `make html` in the docs folder, and you should be able to
navigate to `/docs/_build/html` and view it in your browser

examples/echobot.py

@@ -0,0 +1,18 @@
+# -*- coding: UTF-8 -*-
+
+from fbchat import log, Client
+
+# Subclass fbchat.Client and override required methods
+class EchoBot(Client):
+    def onMessage(self, mid, author_id, message, thread_id, thread_type, ts, metadata, msg):
+        self.markAsDelivered(author_id, thread_id)
+        self.markAsRead(author_id)
+
+        log.info("Message from {} in {} ({}): {}".format(author_id, thread_id, thread_type.name, message)))
+
+        # If you're not the author, echo
+        if author_id != self.uid:
+            self.sendMessage(message, thread_id=thread_id, thread_type=thread_type)
+
+client = EchoBot("<email>", "<password>")
+client.listen()