Enabling optional logging of adding sources

[pjanck]

Added a flag to function AddSource to optionally turn off the logging.

I have only edited on GitHub and have not tried compiling - hopefully the changes are syntactically OK.

Fixes #54

[ByronMayne]

Hey pjack,
Thanks for rising the issue, I can understand that being annoying lol. I think instead though I can just create an settings object that allows you to change the levels. This way if more settings are added we don't just continue expanding the parameters. Let me take a look

[pjanck]

I am happy with any solution :)

I agree that my fix is more "quick and dirty" - if there is a settings object, I will gladly use it appropriately.