Add r libraries for bcbio-rnaseq.
Add r libraries for bcbio-rnaseq.

joemphilips/cloudbiolinux,chapmanb/cloudbiolinux,rchekaluk/cloudbiolinux,chapmanb/cloudbiolinux,joemphilips/cloudbiolinux,rchekaluk/cloudbiolinux,rchekaluk/cloudbiolinux,joemphilips/cloudbiolinux,chapmanb/cloudbiolinux,rchekaluk/cloudbiolinux,chapmanb/cloudbiolinux,joemphilips/cloudbiolinux