Start rewrite (yet again)

This will hopefully be the final rewrite.

example.py

@@ -0,0 +1,26 @@
+import yyb
+
+class MyClient(yyb.Client):
+    async def on_join(self, room):
+        await room.say("Hello!")
+
+    async def on_message(self, message):
+        if message.content == "reply to me"):
+            reply = await message.reply("reply")
+            await reply.reply("reply to the reply")
+            await message.room.say("stuff going on")
+
+        elif message.content == "hey, join &test!":
+            # returns room in phase 3, or throws JoinException
+            room = await self.join("test")
+            if room:
+                room.say("hey, I joined!")
+            else:
+                message.reply("didn't work :(")
+
+    async def before_part(self, room):
+        await room.say("Goodbye!")
+
+# Something like this, I guess. It's still missing password fields though.
+c = MyClient("my:bot:")
+c.run("test", "bots")