Update ruby-19-centos usage script
Merge pull request #20 from jhadvig/ruby_usage_update

Update ruby-19-centos usage script
Enable centosplus repository
Merge pull request #21 from mfojtik/centosplus

Enable centosplus repository
Replace 'yum shell' with 'yum install' as the shell is not returning errors
Merge pull request #23 from mfojtik/yum_install

Replace 'yum shell' with 'yum install' as the shell is not returning errors
README improvements and better geard example
Merge pull request #24 from VojtechVitek/readme

README improvements and better geard example