Add cli flag for specifying config file

- Add cli flag for specifying config file
  (This allows running multiple running instances)
- Fix channel joins by waiting for server reply (thanks benharri)
- Remove toot commands from help message (unannounced feature)
- Update readme

README.md

@@ -5,7 +5,7 @@ A very basic Python IRC bot script.
 
 ## Example: ramenkan
 
-- Install dependencies: `pip install Mastodon.py pyyaml`
+- Install dependencies: Mastodon.py pyyaml
 
 - Copy the `ramenkan/config.sample.yml` as `ramenkan/default.comfig.yml` and
   change the settings as applicable.