message: Support memoId on wallet send in SDK
  Summary:
  The platform API will be able to handle the memoId param after is done
  See:
  Reviewers: dawid, bigly, tyler
  Subscribers: robert, tyler
diff: @@ -957,6 +957,7 @@ Wallet.prototype.removeUser = function(params, callback) {
  * @param {Array} params.unspents - The unspents to use in the transaction. Each unspent should be in the form prevTxId:nOutput
  * @param {String} params.changeAddress - Specifies the destination of the change output
  * @param {Boolean} params.instant - Build this transaction to conform with instant sending coin-specific method (if available)
  + * @param {Boolean} params.memoId - Memo to use in transaction (supported by Stellar)
  * @param callback
  * @returns {*}
  */
  @@ -968,8 +969,8 @@ Wallet.prototype.prebuildTransaction = function(params, callback) {
  'enforceMinConfirmsForChange', 'targetWalletUnspents',
  'message', 'minValue', 'maxValue', 'sequenceId',
  'lastLedgerSequence', 'ledgerSequenceDelta', 'gasPrice',
  - 'noSplitChange', 'unspents', 'changeAddress', 'unspentTypes', 'changeAddressType',
  - 'instant'
  + 'noSplitChange', 'unspents', 'changeAddress', 'unspentTypes',
  + 'changeAddressType', 'instant', 'memoId'
  ]);
  if (_.isUndefined(whitelistedParams.unspentTypes)) {
  @@ -1170,6 +1171,7 @@ Wallet.prototype.send = function(params, callback) {
  * @param {String} params.otp - Two factor auth code to enable sending the transaction
  * @param {String} params.changeAddress - Specifies the destination of the change output
  * @param {Boolean} params.instant - Send this transaction using coin-specific instant sending method (if available)
  + * @param {Boolean} params.memoId - Memo to use in transaction (supported by Stellar)
  * @param callback
  * @returns {*}
  */
  @@ -1199,7 +1201,7 @@ Wallet.prototype.sendMany = function(params, callback) {
  'message', 'minValue', 'maxValue', 'sequenceId',
  'lastLedgerSequence', 'ledgerSequenceDelta', 'gasPrice',
  'noSplitChange', 'unspents', 'comment', 'otp', 'changeAddress',
  - 'instant'
  + 'instant', 'memoId'
  ]);
  const finalTxParams = _.extend({}, halfSignedTransaction, selectParams);
  return this.bitgo.post(this.url('/tx/send'))
  