* start upgrade to node 8 * upgrade travis * improve travis * Remove bluebird, babel (except for modules) from server (WIP) (#9947) * remove bluebird, babel from server (except for modules) * fixes * fix path * fix path * fix export * fix export * fix test * fix tests * remove plugin for transform-object-rest-spread since it is supported in node8 * babel: correct syntax rest spread * remove bluebird * update migrations archive readme * fix package-lock.json * fix typo * add package-loc
* Removed challenge group duplication * Removed duplication of joined challenge * Moved helpers to challenge library * Passed group to function * Fixed group response
