http://rubyonrails.gachinko.org/tag/gemfile/
gem install bundler --pre
bundle install
https://sites.google.com/site/shimesabanote2/linux/centos/ruby_on_rails/raisl_install
sudo yum --enablerepo=remi,remi-test -y install ruby-devel
http://blogs.yahoo.co.jp/take_low_6/23542159.html
sudo yum install mysql-devel
sudo gem install mysql2 -- --with-mysql-lib=/usr/lib64/mysql