Merge branch 'master' into develop

* master:
  1.11.3
  Add pngquant to package.json.
Amend JPEGmini Pro bundle id, refs #79.
Change wording of GUI Script warning, fixes #89.
Merge branch 'develop'

* develop:
  Change wording of GUI Script warning, fixes #89.
  Amend JPEGmini Pro bundle id, refs #79.
1.11.4