Update code to v1beta2

In general, we want to re-render the .md when we update the .Rmd.

It was fine to leave start/end as-is with even numbers.  The sample just attempts to overlap 33054000 in 0-based coordinates.  BUT in re-reading this, I was using the [SNP location](http://www.ncbi.nlm.nih.gov/SNP/snp_ref.cgi?rs=9536314) from the wrong reference.  It should actually overlap 33628137 in 0-based coordinates.