Eradicate all traces of "python example" (#29)

To match with the previous commit

Author: robbai

src/bot.py

@@ -7,7 +7,7 @@
 from util.vec import Vec3
 
 
-class PythonExample(BaseAgent):
+class MyBot(BaseAgent):
 
     def initialize_agent(self):
         # This runs once before the bot starts up