Basic: Added channel specific welcomes.

Signed-off-by: Jakub Novak <jakub.novak@gmail.com>

Basic: Temporary fix for name matching problem.

Signed-off-by: Jakub Novak <jakub.novak@gmail.com>

Basic: Added comment.

 * Adding .lower() fixes problem when a user e.g. "FeroT" logs in with a new nickname "feroT".

Signed-off-by: Jakub Novak <jakub.novak@gmail.com>

Basic: Fixed a comment.

Signed-off-by: Jakub Novak <jakub.novak@gmail.com>