Fix logging

- Following advice here: https://docs.python.org/3/howto/logging.html#configuring-logging-for-a-library
- Renamed the logger: client -> fbchat
- Remove logging_level init parameter from Client
- Use print instead of log.info in examples

examples/removebot.py

@@ -1,4 +1,4 @@
-from fbchat import log, Client
+from fbchat import Client
 from fbchat.models import *
 
 
@@ -6,7 +6,7 @@ class RemoveBot(Client):
     def onMessage(self, author_id, message_object, thread_id, thread_type, **kwargs):
         # We can only kick people from group chats, so no need to try if it's a user chat
         if message_object.text == "Remove me!" and thread_type == ThreadType.GROUP:
-            log.info("{} will be removed from {}".format(author_id, thread_id))
+            print("{} will be removed from {}".format(author_id, thread_id))
             self.removeUserFromGroup(author_id, thread_id=thread_id)
         else:
             # Sends the data to the inherited onMessage, so that we can still see when a message is recieved