Update README.md
Merge branch 'pr1'
Modify Rakefile to run rake spec
Change the order of creating templates
Redhat -> RedHat
Increment version
:serverspec -> :os for convinient to write
Modify sample spec code
Add the description of multi os support
tiny fix
tiny fix
Update README.md
Update README.md
Don't specify ssh user.

It is better to specify user in ~/.ssh/config
added some matcher
Modified be_user, be_group
Merge remote-tracking branch 'pr/3/head' and make some fixes
Use Net::SSH instead of ssh command
Merge branch 'net-ssh' and increment version
Change default value of ret

For easy error handling