nodejs-generator-gulp-angular: version bump 0.7.3 -> 0.8.0

* Add --default option to automatically select all default options
* Add JS preprocessor option, you can choose between:
  - ECMAScript 6 with 6to5 compiler
  - ECMAScript 6 with Google's Traceur compiler
  - CoffeeScript
  - TypeScript
  - None, keep the standard JavaScript code base