add highcharts
move _hero_thirds.html.haml to shared directory
implement basic line chart
implement basic pie chart
add keenio split-rows template
implement combo chart
write about highcharts license
rails g scaffold contributor
add mongoid
rails g mongoid:config
rails g contributor model
add octokit
rails g github_user model
rails g github_repository model
implement fetch_(additions|deletions)_sum
rails g commit model
rails g issue model
display searched full_name and login
rename contributor to contribution
implement fetch_user and fetch_repository in action