chore(server): migrate from new Buffer to Buffer.from

new Buffer(...) has been deprecated since node v6.0.0 and Buffer.from methods should used instead

Fixes #2753

Author: Awk34

Diff for: src/generators/app/index.js

@@ -471,7 +471,7 @@ export class Generator extends Base {
               .toSource();
           }
 
-          file.contents = new Buffer(contents);
+          file.contents = Buffer.from(contents);
         });
 
         let clientJsFilter = filter(['client/**/*.js'], {restore: true});
@@ -508,7 +508,7 @@ export class Generator extends Base {
             tap(function(file, t) {
               var contents = file.contents.toString();
               contents = replacer(contents);
-              file.contents = new Buffer(contents);
+              file.contents = Buffer.from(contents);
             }),
             tsFilter.restore
           ]);
@@ -546,7 +546,7 @@ export class Generator extends Base {
             }),
             tap(file => {
               const contents = pugReplacer(file.contents.toString());
-              file.contents = new Buffer(contents);
+              file.contents = Buffer.from(contents);
             }),
             pugFilter.restore
           ]);

Diff for: templates/app/server/api/user(auth)/user.model(mongooseModels).js

@@ -241,7 +241,7 @@ UserSchema.methods = {
 
         var defaultIterations = 10000;
         var defaultKeyLength = 64;
-        var salt = new Buffer(this.salt, 'base64');
+        var salt = Buffer.from(this.salt, 'base64');
 
         if(!callback) {
             return crypto.pbkdf2Sync(password, salt, defaultIterations, defaultKeyLength, 'sha256')

Diff for: templates/app/server/api/user(auth)/user.model(sequelizeModels).js

@@ -171,7 +171,7 @@ export default function(sequelize, DataTypes) {
 
                 var defaultIterations = 10000;
                 var defaultKeyLength = 64;
-                var salt = new Buffer(this.salt, 'base64');
+                var salt = Buffer.from(this.salt, 'base64');
 
                 if(!callback) {
                     return crypto.pbkdf2Sync(password, salt, defaultIterations, defaultKeyLength, 'sha256')