[Ruby] Rename files/folders (#534)

* Rename templateDir: rails5 -> ruby-on-rails-server

* Rename script: rails5-petstore-server.sh -> ruby-on-rails-server-petstore.sh

* Rename sample folder: rails5 -> ruby-on-rails

* Rename script(openapi3): rails5-petstore-server.sh -> ruby-on-rails-server-petstore.sh

* Update ruby-on-rails-server-petstore.sh

* Rename templateDir: sinatra -> ruby-sinatra-server

* Rename script: sinatra-petstore-server.sh -> ruby-sinatra-server-petstore.sh

* Rename sample folder: sinatra -> ruby-sinatra

* Update script

* Rename templateDir: ruby -> ruby-client

* Rename script: ruby-petstore.sh -> ruby-client-petstore.sh

* Update scripts

* Update samples

- bin/ruby-sinatra-server-petstore.sh
- bin/ruby-on-rails-server-petstore.sh
- bin/ruby-client-petstore.sh
- bin/security/ruby-client-petstore.sh

samples/server/petstore/ruby-sinatra/my_app.rb

@@ -0,0 +1,13 @@
+require './lib/openapiing'
+
+# only need to extend if you want special configuration!
+class MyApp < OpenAPIing
+  self.configure do |config|
+    config.api_version = '1.0.0' 
+  end
+end
+
+# include the api files
+Dir["./api/*.rb"].each { |file|
+  require file
+}