fix(app-dependency): change ngmin to ng-annotate

ngmin is now deprecated, the author has suggested ng-annotate as a replacement

Changes:
- switch dev-dependency from grunt-ngmin to grunt-ng-annotate
- use ngAnnotate config instead of ngmin

closes #372
Merge branch 'feature/ngmin-to-ngAnnotate' of github.com:kingcody/generator-angular-fullstack into feature/ngmin-to-ngAnnotate