naked pkgs / container refactor

• def2ec4 fix download to track with upstream api change
• ec18210 Remove .DS_Store files when uninstalling packages
• a9cd8e7 fix a few bugs around recent changes
• 711e44b reverse default for SystemCommand's print option
• 49e29bc require tmpdir to fix container error
• 70ba5c4 pkg uninstall: support kernel extension unloading
• 357c491 when uninstalling pkgs; sudo chmod before examining
• 21f1cc6 naked pkg - save files with spaces properly
• 3c9423e naked pkg support + major container refactor