Side rail updates

rails.html

<script>
  googletag.cmd.push(function() {

    var bannerMapping = googletag.sizeMapping().
      addSize([1050, 500], [[970, 120], [970, 90], [728, 90]]).
      addSize([320, 400], [[320,50], [320, 100]]). //iphone 4 etc
      addSize([550, 300], [[320, 50], [320, 100]]). //iphone 6 plus etc
      addSize([600, 250], [[320, 50], [320, 100]]). //droid turbo, nexus 6 etc
      build();

    var railMapping = googletag.sizeMapping().
      addSize([1050, 500], [[300, 250], [300, 600]]).
      addSize([320, 400], [[300, 250], [300, 600]]).
      build();

    googletag.defineSlot('/83332100/Blog_RectangleTop', [[300, 600], [300, 250]], 'div-gpt-ad-1479909427189-0').defineSizeMapping(railMapping).addService(googletag.pubads());
    googletag.defineSlot('/83332100/Blog_RectangleLower', [[300, 250], [300, 600]], 'div-gpt-ad-1479909513185-0').defineSizeMapping(railMapping).addService(googletag.pubads());
    googletag.defineSlot('/83332100/Blog_Nav', [[970, 125], [728, 90], [970, 90], [970, 120]], 'div-gpt-ad-1479909563527-0').defineSizeMapping(bannerMapping).addService(googletag.pubads());
    googletag.defineSlot('/83332100/Blog_Footer_Inner', [[728, 90], [970, 120], [970, 90], [970, 125]], 'div-gpt-ad-1480437454408-0').defineSizeMapping(bannerMapping).addService(googletag.pubads());
    googletag.defineSlot('/83332100/Blog_Bottom', [[970, 125], [728, 90], [970, 120], [970, 90]], 'div-gpt-ad-1479909620043-0').defineSizeMapping(bannerMapping).addService(googletag.pubads());
    googletag.pubads().enableSingleRequest();
    googletag.enableServices();
  });
</script>