Added prefixes for incoming commands

Bot now checks if the query matches the configured prefix. Also added
the config implementation into this dummy plugin file.
Added prefix item to config
Corrected comment
Dummy user config file
Added hostname for user authentication

Added the users hostname to the messageReceived subroutine.
Updated ignore rules
Added user administration script

Will be expanded in the next couple of hours. This script can check if a
user is authenticated for commands and it can add new users.
User right check on rehash/Added comments/More

- The rehash command now checks if the user is authorized for the
command
- Added some comments to keep everything neat
- Added command registration function for 'help' command