Stop cleaning dist/ when running `testem`
Stop cleaning dist/ when running `testem`

  This was causing a noisy `git status` when running `testem`

TakaGoto/dash-modal.js,samaritanministries/dash-modal.js,TakaGoto/dash-modal.js,samaritanministries/dash-modal.js,TakaGoto/dash-modal.js,samaritanministries/dash-modal.js