message: log wallet id instead of wallet in error
  Summary: wirex showed us an error where we were logging "Error estimating fee for send from [object Object]: socket hang up", because we were logging the wrong data
  Reviewers: arik
  Subscribers: ben
diff: @@ -222,7 +222,7 @@ exports.createTransaction = function(params) {
  .then(function(result) {
  var estimatedFeeRate = result.cpfpFeePerKb;
  if (estimatedFeeRate < constants.minFeeRate) {
  - console.log(new Date() + ': Error when estimating fee for send from ' + params.wallet + ', it was too low - ' + estimatedFeeRate);
  + console.log(new Date() + ': Error when estimating fee for send from ' + params.wallet.id() + ', it was too low - ' + estimatedFeeRate);
  feeRate = constants.minFeeRate;
  } else if (estimatedFeeRate > params.maxFeeRate) {
  feeRate = params.maxFeeRate;
  @@ -239,7 +239,7 @@ exports.createTransaction = function(params) {
  else {
  // couldn't estimate the fee, proceed using the default
  feeRate = constants.fallbackFeeRate;
  - console.log("Error estimating fee for send from " + params.wallet + ": " + e.message);
  + console.log("Error estimating fee for send from " + params.wallet.id() + ": " + e.message);
  return Q();
  }
  });
  