official router for Vue.js

 vue-router deeply integrates with Vue.js core to make building Single Page
 Applications with Vue.js a breeze. Features include:
  - Nested route/view mapping
  - Modular, component-based router configuration
  - Route params, query, wildcards
  - View transition effects powered by Vue.js' transition system
  - Fine-grained navigation control
  - Links with automatic active CSS classes
  - HTML5 history mode or hash mode, with auto-fallback in IE9
  - Customizable Scroll Behavior