code: function(str){
              str = (str || "").toString();
              str = str.replace(/\=(?:\r?\n|$)/g, "");
              var str2 = "";
              for(var i=0, len = str.length; i<len; i++){
                  chr = str.charAt(i);
                  if(chr == "=" && (hex = str.substr(i+1, 2)) && /[\da-fA-F]{2}/.test(hex)){
                      str2 += String.fromCharCode(parseInt(hex,16));
                      i+=2;
                      continue;
                  }
                  str2 += chr;
              }
              return str2;
          }
docs: Quoted Printable Parser
  
  Parses quoted-printable strings, which sometimes appear in
  vCard 2.1 files (usually the address field)
  
  Code adapted from:
  https://github.com/andris9/mimelib