message: hub:start should apply default elasticsearch prefix
  so apps and environments don't leak state to each other
diff: @@ -29,6 +29,9 @@ module.exports = {
  if (!process.env.DEBUG_COLORS) {
  process.env.DEBUG_COLORS='yes';
  }
  + if (!process.env.ELASTICSEARCH_PREFIX) {
  + process.env.ELASTICSEARCH_PREFIX = this.project.pkg.name.replace(/^[^a-zA-Z]*/, '').replace(/[^a-zA-Z0-9]/g, '_') + '_' + args.environment;
  + }
  // I think this flag needs to get refactored away, it's always the
  // right behavior to have it turned on, there's no time that your
  