CLI does not clear out app-script process

[mhartington]

$ ps -ef | grep "ionic"
  501 72291 77294   0 12:22PM ttys002    0:00.00 grep ionic
  501 26193     1   0 11:26AM ttys003   24:23.83 node /Users/mhartington/GitHub/StarTrack-Ionic/node_modules/.bin/ionic-app-scripts watch
  501 30229     1   0 11:31AM ttys003   19:51.64 node /Users/mhartington/GitHub/StarTrack-Ionic/node_modules/.bin/ionic-app-scripts watch
  501 37869     1   0 11:40AM ttys003   14:33.07 node /Users/mhartington/GitHub/StarTrack-Ionic/node_modules/.bin/ionic-app-scripts watch
  501 40785     1   0 11:43AM ttys003   12:08.10 node /Users/mhartington/GitHub/StarTrack-Ionic/node_modules/.bin/ionic-app-scripts watch --debug
  501 44411     1   0 11:48AM ttys003   10:28.36 node /Users/mhartington/GitHub/StarTrack-Ionic/node_modules/.bin/ionic-app-scripts watch --debug
  501 66300     1   0 10:13AM ttys003   25:21.06 node /Users/mhartington/GitHub/StarTrack-Ionic/node_modules/.bin/ionic-app-scripts watch --debug
  501 69471 87435   0 12:18PM ttys003    0:04.23 ionic
  501 69735 69668   0 12:18PM ttys003    0:26.11 node /Users/mhartington/GitHub/StarTrack-Ionic/node_modules/.bin/ionic-app-scripts watch --debug

Process hang around after ionic serve has been killed.