Support for ignoring some types of exceptions

[enkelmedia]

I have an issue where a ImageProcessor throws errors all the time, I can't rewrite the code for the processor so I'm thinking that it might be a good idea to be able to pass a list of exceptions that we don't what to send messages on.

My first idea is to create some kind of static list that one can append to during the application startup. What do you think about this?

I'll might add a proof of concept and push as a pull request.