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...
remove comment and add thin
add Procfile
add How to Deploy to Heroku section