code: function around (items, center, padding, block) {
    var result = '';
    var options = (block && block.hash) ?  R.merge(defaults, block.hash) : R.clone(defaults);
    var max, start, end;
  
    center = parseFloat(center) + options.offset;
    padding = parseFloat(padding);
    max = padding * 2 + 1;
  
    if (items.length > max) {
      start = center - padding;
      end = center + padding + 1;
  
      if (start < 0) {
        end -= start;
        start = 0;
      }
  
      if (end > items.length) {
        start -= end - items.length;
        end = items.length;
      }
  
      items = items.slice(start, end);
    }
  
    for (var item in items) {
      result += block.fn(items[item]);
    }
  
    return result;
  }
docs: Slices a list based on a center-point and a maximum amount of "padding"
  before and after. Useful for pagination.
  
  Supports an optional <code>offset</code> hash option in case your center
  value isn't matching up with your array indexes.
  
  @since v0.0.1
  @param {Array} items - Collection to iterate over.
  @param {Number} center - The center-point of the collection (for example, current page).
  @param {Number} padding - The amount of items to allow before or after the center.
  @param {Object} block
  @return {String}
  @example
  <ul>
  {{#around pages 5 2 offset=-1}}
  <li><a href="/page/{{num}}">Page {{num}}</a></li>
  {{/around}}
  </ul>
  
  {{! Output: }}
  <ul>
  <li><a href="/page/3">Page 3</a></li>
  <li><a href="/page/4">Page 4</a></li>
  <li><a href="/page/5">Page 5</a></li>
  <li><a href="/page/6">Page 6</a></li>
  <li><a href="/page/7">Page 7</a></li>
  </ul>