slim down lists of referenced companion libs

Author: chrisvfritz

src/guide/overview.md

@@ -117,4 +117,4 @@ You may have noticed that Vue components are very similar to **Custom Elements**
 
 2. Vue components provide important features that are not available in plain custom elements, most notably cross-component data flow, custom event communication, and dynamic component switching with transition effects.
 
-The component system is the foundation for building large apps with Vue. The Vue ecosystem also provides advanced tooling and officially supported companion libraries that can be combined to create a more framework-like system. The responsibilities of these libraries include [ajax](https://github.com/vuejs/vue-resource), [routing](https://github.com/vuejs/vue-router), [flux-like state management](https://github.com/vuejs/vuex), and [more](https://github.com/vuejs).
+The component system is the foundation for building large apps with Vue. The Vue ecosystem also provides advanced tooling and officially supported companion libraries that can be combined to create a more framework-like system. The responsibilities of these libraries include [routing](https://github.com/vuejs/vue-router), [flux-like state management](https://github.com/vuejs/vuex), and [more](https://github.com/vuejs).

src/guide/plugins.md

@@ -126,8 +126,6 @@ webpack plugin.js bundle.js --optimize-minimize
 
 - [vue-router](https://github.com/vuejs/vue-router): The official router for Vue.js. Deeply integrated with Vue.js core to make building Single Page Applications a breeze.
 
-- [vue-resource](https://github.com/vuejs/vue-resource): A plugin that provides services for making web requests and handle responses using a XMLHttpRequest or JSONP.
-
 - [vue-async-data](https://github.com/vuejs/vue-async-data): Async data loading plugin.
 
 - [vue-validator](https://github.com/vuejs/vue-validator): A plugin for form validations.