step-by-step pipeline separator conflict

Hi there

In the [step-by-step pipeline](https://github.com/egluckthaler/starfish/wiki/Step-by-step-tutorial) there are several lines that use ```grep -v '#'``` to get rid of some headers/notes in certain files
I think this can be changed to ```grep -v ^'#'``` to avoid conflicts with '#' separators used in contigs (recommended for PanSN-spec naming) and still removing all comments etc

Cheers