Define user and group methods explicitly in Serverspec::Type::Process

Because user and group methods are defined already in Serverspec::Helper::Type.
So method_missing is not called if these methods are not defined explicitly.
Add spec.
Bump up version
Fix spec for specinfra v0.4.1
Move spec/backend/exec/build_command_spec.rb to specinfra
Change regex to match more vagrant machine names

Support machine name that contains digits or uppercase letters.
Bump up version
Fix to spec_helper to use SpecInfra::CommandResult
Fix to use SpecInfra::CommandResult
Bump up version and specinfra version dependency
Add create_release task
Fix to work without octokit
Fix syntax error for Ruby 1.8.7
merged
added an entry into the windows_support document
Bump up dependency of specinfra version
Add octorelease
Bump up version
pass provider into the feature checking powershell
added documentation for different providers