message: add noSplitChange param for prebuildTransaction
  Reviewers: arik, kevin
  Subscribers: ben
diff: @@ -732,7 +732,8 @@ Wallet.prototype.prebuildTransaction = function(params, callback) {
  'recipients', 'numBlocks', 'feeRate', 'minConfirms',
  'enforceMinConfirmsForChange', 'targetWalletUnspents',
  'message', 'minValue', 'maxValue', 'sequenceId',
  - 'lastLedgerSequence', 'ledgerSequenceDelta', 'gasPrice'
  + 'lastLedgerSequence', 'ledgerSequenceDelta', 'gasPrice',
  + 'noSplitChange'
  ]);
  const self = this;
  