Specifying skipped notebooks needs improvement

[jlstevens]

On two separate occasions I have been frustrated with how difficult it is to skip notebooks with nbsmoke. Regular expressions are not always trivial to get right (e.g what symbols need escaping and how?) and often all you want to do is to exclude a specific notebook by its exact filename.

I have found myself trying different regular expressions several times only to find later that the intended notebook was not get skipped. It is possible that this problem has been compounded by not knowing whether I need to use skip_run on nbsmoke_skip_run which means my regular expressions may have been correct but specified in the wrong place.

At any rate, I would like is a much simple option to list the notebooks to skip by their exact file names to avoid the cognitive effort of thinking about regular expressions. This does not mean it shouldn't be possible to use regular expressions when required but I do believe a simple list would suffice in most cases.