Added options to restrict run to specified repo items.
More explicit help string for items argument to iconimporter.

As per discussion in pull request #413.
Merge pull request #413 from jlrgraham/iconimporter

iconimporter: Added an option to restrict run to specified repo items.
Merge branch 'master' into NSURL
Adding uninstall description pkginfo key
Merge pull request #414 from gbatye/master

Adding uninstall description pkginfo key
Merge branch 'master' into NSURL