Remove plugins/hello.py

This was solely a testing module for the plugin/commands system, and serves no purpose anymore. commands.py provides basic commands that are both simple and actually useful.

config.yml.example

@@ -27,5 +27,4 @@ server:
 
 # Plugins to load (omit the .py extension)
 plugins:
-    - hello
     - commands

plugins/hello.py

@@ -1,7 +0,0 @@
-import sys, os
-sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
-import utils
-
-@utils.add_cmd
-def hello(irc, source, args):
-   utils.msg(irc, source, 'hello!')