Tidy up the Gemfile
Add schema.rb

If we're not using any non-standard vendor-specific SQL features, it's
better to keep it under version control.
Use MySQL for the production database
Use puma as a production app server
Eager-load all .rb files in lib/

This is needed for thread-safety, since we're using puma in threaded
mode. The reason for this is that require in Ruby is not thread-safe and
all requiring should happen at first app load.
Install and configure capistrano for deployment
Tell Rails that the app is in a subfolder