Updated for 0.31.
High-res (@2x) icon required by App Store rules.
App Store builder.
More App Store nonsense.
Allow building the semi-standalone app for the .dmg the old way (almost).
Use the old .icns file for the .dmg (mkapp) build.
Exception for launchservicesd no longer needed? At least on 10.9 and
10.10. (I'm not sure why it was needed in the first place.)