title: Map SNP IDs to genome coordinates
body: <p>I have several <a href="http://en.wikipedia.org/wiki/Single-nucleotide_polymorphism" rel="noreferrer">SNP</a> IDs (i.e., rs16828074, rs17232800, etc...), I want to their coordinates in a Hg19 genome from <a href="http://genome-euro.ucsc.edu/" rel="noreferrer">UCSC genome website</a>.</p>
  
  <p>I would prefer using <code>R</code> to accomplish this goal.  How to do that?</p>