message: now possible to submit half-signed transactions to BitGo in v2
  Reviewers: barath, benchan
  Subscribers: ben
diff: @@ -338,6 +338,20 @@ Wallet.prototype.signTransaction = function(params, callback) {
  .nodeify(callback);
  };
  +/**
  + * Submits a half-signed transaction to BitGo
  + * @param params
  + * - txHex: transaction hex to submit
  + * @param callback
  + */
  +Wallet.prototype.submitTransaction = function(params, callback) {
  + common.validateParams(params, ['txHex'], ['otp'], callback);
  + return this.bitgo.post(self.baseCoin.url('/wallet/' + this.id() + '/tx/send'))
  + .send(params)
  + .result()
  + .nodeify(callback);
  +};
  +
  /**
  * Send coins to a recipient
  * @param params
  