Add config.ru in attempt to deploy example apps to Heroku.
Oops, Gemfile was a symlink.
Bug fix: Sinatra won't serve from public_dir.
Allow all example directories to connect to Heroku's database instead of only localhost.
Attempt to serve some static files so spilled drink and empty stage pictures show.
Oops didn't mean to serve static for path /
Added example 305.
Added example 306.
Use migrations and separate database instead of .sql file.
Better docs with Gemfile, add pry-rails
Bug fix: database name must be string not integer
Add verification number; fix limit in schema.
Added answer to 303 as 308.
Merge branch 'master' into JH