style: rubocop mostly auto-correct

.rubocop.yml

.rubocop_todo.yml

Rakefile

bin/nickserver

lib/kernel_ext.rb

lib/nickserver/adapters/celluloid_http.rb

lib/nickserver/adapters/http.rb

lib/nickserver/config.rb

lib/nickserver/couch_db/response.rb

lib/nickserver/couch_db/source.rb

lib/nickserver/daemon.rb

lib/nickserver/dispatcher.rb

lib/nickserver/email_address.rb

lib/nickserver/handler_chain.rb

lib/nickserver/hkp/client.rb

lib/nickserver/hkp/key_info.rb

lib/nickserver/hkp/parse_key_info.rb

lib/nickserver/hkp/response.rb

lib/nickserver/hkp/source.rb

lib/nickserver/hkp/v_index_response.rb