Play 2.0 Scala TodoList tutorial

This is the code for the todolist tutorial found on the Play! Framework site: http://www.playframework.org/documentation/2.0/ScalaTodoList

Updates to provided documentation:

• Added the line "import models._" to Application.scala as the application will not compile without it during the ''Rendering the first page'' step
• Added a few comments to help new users along the way

This demo application can be found on heroku here: http://gentle-river-6344.herokuapp.com/