ConfigCommand, TestCommand - Tweak prompts
composer.json - Add symfony/process and symfony/finder
ConfigPrompt - Tweak layout
Add services based on "PermissionInterface"
ConfigCommand - Add UI for setting perm_* options
DatadirCommand - Add command to declare data directories
TestCommand - Check that data directories are actually writeable
Update README.md
Merge pull request #1 from totten/master-perm

Set permissions on data directories