first
add rspec to gemfile
update gitignore
add logger
add platform
add dependencies
add system preprocess, platform check
add :system key
completed preprocessors
add yardocs to logger.rb
moved package_installer to installer
remove system_installer class
adding yardoc
add yardoc to platform
add package manager infrastructure
add APT package manager
fix package manager inclusion
Ppa class uses new PackageManager interface
disabled execution for testing purposes of PackageManager issued commands
remove Ppa class, switch to PackageManager interface