Bioinformatics python capstone lesson

This lesson is intended to be a 1.5 hour demo that will sit at the end of a novice python bootcamp and show learners how to apply some of their new skills to bioinformatics. Currently work in progress, contributions/suggestions very welcome!
Looks great! I wonder if it would be worth mentioning some of the issues discussed in https://github.com/swcarpentry/bc/issues/532, to also clarify motivation. It did feel a bit like wait - why aren't we assembling reads etc? I think those are thoughts that many biologists and instructors will have, and they are covered off quite well in your comments on that issue thread. But I do think being up front about what is and isn't possible, due to installation, RAM etc, helps get everyone on board with what we ARE doing here. And maybe also emphasizing, that yeah, this is one way of looking at genomic data, and it might not be an analysis that an individual biologist might ever want to do, but the *concepts*, using a command line program, using flags, piping commands, bootstrapping and making a figure *are* transferable skills. Addressing those potential issues head on  I think will strengthen the content, and help students not get derailed by thinking - oh, I'm not going to do this analysis so I don't need to follow this.
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