rm & from end of scripts, rm watch-all script
rm & from end of scripts, rm watch-all script

* Ava can get flaky sometimes, needing to be restarted, and having "&" within the script call prevents script from being added to linux jobs list. Can just say "npm run watch-test &" for same behavior. Remove from others for consistency and added benefit of showing up in jobs list.

* watch-all script was just an extra convenience that no longer makes sense without "&" being embedded in the scripts it calls.

skylize/clerc