code: function scrapDescription(window){
     var $ = window.$;
     var descriptions = [];
  
     // Open Graph protocol by Facebook <meta property="og:description" content="(*)"/>
     $('meta[property="og:description"]').each(function(){
        var content = $(this).attr('content');
        if(content) descriptions.push(content);
     });
  
     // Schema.org : <* itemprop="description">(*)</*>
     $('[itemprop="description"]').each(function(){
        var text = $(this).text();
        if(text) descriptions.push(text);
     });
  
     // Meta tag description: <meta property="description" content="(*)" />
     $('meta[name="description"]').each(function(){
        var description = utils.inline($(this).attr('content')).trim();
        if(description) descriptions.push(description);
     });
  
     // Random text in div and p tags. Oriented product informations
     if(descriptions.length === 0){
        $('div,p').each(function(){
           if( ($(this).attr('class') && $(this).attr('class').toLowerCase() === 'productdesc') || ($(this).attr('id') && $(this).attr('id').toLowerCase() === 'productdesc')){
              var description = utils.inline($(this).text()).trim();
              if(description) descriptions.push(description);
           }
        });
     }
     return descriptions;
  }
docs: Retrieve descriptions of the page
  
  @param  {Object} window - object representating the window
  @return {Array}
  @api public