A capstone example for Bioinformatics in R

The idea here is to show learners how to apply novice R lessons to bioinformatics. This is a very hastily prepared pull request for work in progress but contributions and suggestions very welcome!
I agree it would be a good idea to explain bioconductor here.  It's an awesome resource, but the idea of installing from a non-CRAN source might be new to a lot of people. Once the students know about it and how to use the tools available there, it really opens up a lot of possibilities for them,