This application utilizes Ruby, Sinatra, and Redis.

Roughly goes like this

1. install rvm
2. install a ruby, preferrably 1.9.3
3. install homebrew
4. install redis via homebrew
5. bundle install
6. gem install shotgun --- for debug mode code reloading for sinatra
7. shotgun -p 3000 app.rb
8. visit http://localhost:3000

Roughly the same as Mac above, except

1. instead of homebrew, just use apt-get or aptitude
2. apt-get install redis-server

• create a score calculator -- walk the tree and calcualte score, likely