Merge pull request #141 from mizzy/add-custom-failure-message-for-should_not

Add custom failure message for should_not
Bump up version
Use Comands::Base automatically before OS detection
Merge pull request #142 from mizzy/implicit-commnds-base-class

Use Comands::Base automatically before OS detection
Bump up version
Use Commands::Base without OS detection
Merge pull request #143 from mizzy/use-commands-base-before-os-detection

Use Commands::Base without OS detection
OS detection doesn't check RSpec.conifugraion.os now
Merge pull request #144 from mizzy/os-detection-without-rspec-configuration

OS detection doesn't check RSpec.configuration.os now
Bump up version
Fix the bug of duplicating sudo with Backend::Ssh
Merge pull request #146 from mizzy/fix-duplication-of-sudo

Fix the bug of duplicating sudo with Backend::Ssh
Bump up version
use 'env' to set PATH'
Merge pull request #147 from hayato1980/master

use 'env' to set PATH
Fix tests for env prefix
Bump up version
Remove specs for obsolete syntax
Remove matcher/be_default_gateway
Remove matcher/be_directory