Ruby on Rails Tutorial: "hello, world!"

This is the first application for the [* Ruby on Rails Tutorial*]( http:// www.railstutorial.org/) by [Michael Hartl]( http:// www.michaelhartl.com/).

Hartl, Michael (2015-04-24). Ruby on Rails Tutorial: Learn Web Development with Rails (Addison-Wesley Professional Ruby Series) (Kindle Locations 1461-1464). Pearson Education. Kindle Edition.