update readme url
Merge pull request #6 from bparees/master

update readme url
Update README.md
Merge pull request #7 from openshift/blog_part1

Update README.md
Update Dockerfile
Update Dockerfile
Connect Ruby app to database.
  - Update CentOS image, to Ruby2.0
  - Install MySQL2, Active Record  gems
  - Connect Sinatra app to database
Merge pull request #5 from marianitadn/connect-app-to-database

Connect Ruby app to database.