Cleanup CRLF
Gemfile should be in project fellows
Refactor gem dependencies
Sinatra-valid development settings

- see http://www.sinatrarb.com/intro#Configuration
config.ru should have minimal settings
Display japanese font using ruby-pango

- heavily refer https://github.com/clear-code/nafuda_generator/blob/master/app.rb
Detect a proper font family or specific one

- pass font=XXX if want
Write to tempfile in order to run in heroku

- Cannot write files under ROOT/views maybe
- https://devcenter.heroku.com/articles/read-only-filesystem
Update cairo to force using rb_errinfo()
Remove haml :doitnow that has no effect

- Sinatra just renders string evaluated at the end
Fix typo and bootstrap class in view
Revert pango unavailable in heroku...