docs: function(callback){
                  //  %{xcrun -sdk iphoneos PackageApplication -v "#{@app_path}" -o "#{@ipa_path}" --embed "#{@dsym_path}"
  
                  var cmd = [
                      'xcrun -sdk iphoneos PackageApplication',
                      '-v ' + appPath,
                      '-o ' + ipaPath,
                      '--embed ' + dsymPath
                  ].join(' ');
  
                  console.log(cmd);
  
                  child_process.exec(cmd, {'cwd': ctx.path(ctx['native path'])}, function(err, stdout, stderr){
                      if(err){
                          return callback(err);
                      }
                      debug('ipa built to', ipaPath);
                      debug('stdout', stdout);
                      debug('stderr', stderr);
                      ctx.ipaPath = ipaPath;
                      callback();
                  });
              }