Add test, JavascriptSDK 1.7.1 rest format not as expected

JavascriptSDK 1.7.1 use serverUrl/classes/_Role directly.
So move validation from RolesRouter to ClassesRouter.

src/Routers/ClassesRouter.js

@@ -81,6 +81,9 @@ export class ClassesRouter extends PromiseRouter {
   }
 
   handleCreate(req) {
+    if(req.params.className === '_Role' && req.body && !req.body.name){
+      throw new Parse.Error(135, 'Role names must be specified.');
+    }
     return rest.create(req.config, req.auth, req.params.className, req.body);
   }
 

src/Routers/RolesRouter.js

@@ -16,9 +16,6 @@ export class RolesRouter extends ClassesRouter {
 
   handleCreate(req) {
     req.params.className = '_Role';
-    if(req.body && !req.body.name){
-      throw new Parse.Error(135, 'Role names must be specified.');
-    }
     return super.handleCreate(req);
   }