Add option modelPropertyNaming to javascript generator (#299)

* Add option modelPropertyNaming to javascript generator

Fixes 6530

* Update Petstore sample

samples/client/petstore/javascript-es6/src/api/PetApi.js

@@ -1,12 +1,12 @@
 /**
- * Swagger Petstore
+ * OpenAPI Petstore
  * This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\
  *
  * OpenAPI spec version: 1.0.0
- * Contact: apiteam@swagger.io
+ * 
  *
- * NOTE: This class is auto generated by the swagger code generator program.
- * https://github.com/swagger-api/swagger-codegen.git
+ * NOTE: This class is auto generated by OpenAPI Generator (https://openapi-generator.tech).
+ * https://openapi-generator.tech
  * Do not edit the class manually.
  *
  */
@@ -45,16 +45,15 @@ export default class PetApi {
 
     /**
      * Add a new pet to the store
-     * 
-     * @param {module:model/Pet} body Pet object that needs to be added to the store
+     * @param {module:model/Pet} pet Pet object that needs to be added to the store
      * @param {module:api/PetApi~addPetCallback} callback The callback function, accepting three arguments: error, data, response
      */
-    addPet(body, callback) {
-      let postBody = body;
+    addPet(pet, callback) {
+      let postBody = pet;
 
-      // verify the required parameter 'body' is set
-      if (body === undefined || body === null) {
-        throw new Error("Missing the required parameter 'body' when calling addPet");
+      // verify the required parameter 'pet' is set
+      if (pet === undefined || pet === null) {
+        throw new Error("Missing the required parameter 'pet' when calling addPet");
       }
 
 
@@ -69,7 +68,7 @@ export default class PetApi {
 
       let authNames = ['petstore_auth'];
       let contentTypes = ['application/json', 'application/xml'];
-      let accepts = ['application/xml', 'application/json'];
+      let accepts = [];
       let returnType = null;
 
       return this.apiClient.callApi(
@@ -89,7 +88,6 @@ export default class PetApi {
 
     /**
      * Deletes a pet
-     * 
      * @param {Number} petId Pet id to delete
      * @param {Object} opts Optional parameters
      * @param {String} opts.apiKey 
@@ -118,7 +116,7 @@ export default class PetApi {
 
       let authNames = ['petstore_auth'];
       let contentTypes = [];
-      let accepts = ['application/xml', 'application/json'];
+      let accepts = [];
       let returnType = null;
 
       return this.apiClient.callApi(
@@ -276,16 +274,15 @@ export default class PetApi {
 
     /**
      * Update an existing pet
-     * 
-     * @param {module:model/Pet} body Pet object that needs to be added to the store
+     * @param {module:model/Pet} pet Pet object that needs to be added to the store
      * @param {module:api/PetApi~updatePetCallback} callback The callback function, accepting three arguments: error, data, response
      */
-    updatePet(body, callback) {
-      let postBody = body;
+    updatePet(pet, callback) {
+      let postBody = pet;
 
-      // verify the required parameter 'body' is set
-      if (body === undefined || body === null) {
-        throw new Error("Missing the required parameter 'body' when calling updatePet");
+      // verify the required parameter 'pet' is set
+      if (pet === undefined || pet === null) {
+        throw new Error("Missing the required parameter 'pet' when calling updatePet");
       }
 
 
@@ -300,7 +297,7 @@ export default class PetApi {
 
       let authNames = ['petstore_auth'];
       let contentTypes = ['application/json', 'application/xml'];
-      let accepts = ['application/xml', 'application/json'];
+      let accepts = [];
       let returnType = null;
 
       return this.apiClient.callApi(
@@ -320,7 +317,6 @@ export default class PetApi {
 
     /**
      * Updates a pet in the store with form data
-     * 
      * @param {Number} petId ID of pet that needs to be updated
      * @param {Object} opts Optional parameters
      * @param {String} opts.name Updated name of the pet
@@ -351,7 +347,7 @@ export default class PetApi {
 
       let authNames = ['petstore_auth'];
       let contentTypes = ['application/x-www-form-urlencoded'];
-      let accepts = ['application/xml', 'application/json'];
+      let accepts = [];
       let returnType = null;
 
       return this.apiClient.callApi(
@@ -371,7 +367,6 @@ export default class PetApi {
 
     /**
      * uploads an image
-     * 
      * @param {Number} petId ID of pet to update
      * @param {Object} opts Optional parameters
      * @param {String} opts.additionalMetadata Additional data to pass to server