message: use correct field name for unspent confirmations
  Summary: server returns unspents with the field "confirmations"
  Reviewers: benchan
  Subscribers: ben
diff: @@ -279,7 +279,7 @@ exports.createTransaction = function(params) {
  // create array of unconfirmed unspent ID strings of the form "txHash:outputIndex"
  zeroConfUnspentTxIds = _(results.unspents).filter(function(u) {
  - return u.confs;
  + return !u.confirmations;
  }).map(function(u) {
  return u.tx_hash + ':' + u.tx_output_n;
  }).value();
  