[1246] Aliases broken in rc3

Seems like aliases (ie: ~components = ~/components, ~plugins = ~/plugins, etc) are broken in 1.0.0-rc3, at least in my project.

Accidentally upgrading from nuxt 1.0.0-alpha5 to 1.0.0-rc3 ended up with these errors when running npm run build:

These dependencies were not found:

* ~components/category-filter.vue //...etc

In 1.0.0-alpha5 dist/nuxt.js contained the following but it is missing in 1.0.0-rc3

/node_modules/nuxt/dist/nuxt.js:
  365          '~router': __webpack_require__.i(__WEBPACK_IMPORTED_MODULE_2_path__["join"])(this.buildDir, 'router'),
  366          '~pages': __webpack_require__.i(__WEBPACK_IMPORTED_MODULE_2_path__["join"])(this.srcDir, 'pages'),
  367:         '~components': __webpack_require__.i(__WEBPACK_IMPORTED_MODULE_2_path__["join"])(this.srcDir, 'components')
  368        },
  369        modules: [__webpack_require__.i(__WEBPACK_IMPORTED_MODULE_2_path__["join"])(this.dir, 'node_modules'), nodeModulesDir]
//etc