Update README.rst R "library" -> "package"
Update README.rst R "library" -> "package"

Perhaps pedantry, but R has *packages* which are installed into *libraries*. Also, using "package" helps to avoid confusion between those and system libraries required to run certain packages.
Bioconductor/GoogleGenomics,deflaux/GoogleGenomics,Bioconductor/GoogleGenomics,Bioconductor/GoogleGenomics,deflaux/GoogleGenomics,deflaux/GoogleGenomics