Rename directory
Add backend_for(:type) helper method
Include SpecInfra::Helper::Backend
Add dummy commands::base class for testing
Add spec for backend helper
Merge pull request #4 from serverspec/backend-helper

Add backend_for(:type) helper method to get SpecInfra::Backend::Foo object
Bump up version
Add empty SpecInfra::Command::Base class
Replace SPEC_TYPE to SpecInfra
Add requirements for command classes
Cmmands -> Command
Now SpecInfra has Commands::Base class, so don't need to define a dummy class for testing
Move Serverspec::Commands::AIX to SpecInfra::Command::AIX
Copy all methods from Serverspec::Commands::Base
Move Command::Linux and Command::Debian from serverspec
Remove shellwords because it is required in base class
Move Command::Darwin from serverspec
Move Command::FreeBSD from serverspec
Move Command::Gentoo from serverspec
Move Command::Plamo from serverspec