fixed when npm install extract-text-webpack-plugin@beta not found error ( vuematerial#665 ) (vuematerial#666)

* Update package.json

* Update mdSpinner.vue

Author: xinzhanguo

package.json

@@ -69,7 +69,7 @@
     "eslint-plugin-html": "^2.0.0",
     "eventsource-polyfill": "^0.9.6",
     "express": "^4.14.1",
-    "extract-text-webpack-plugin": "beta",
+    "extract-text-webpack-plugin": "^2.1.0",
     "file-loader": "^0.10.0",
     "friendly-errors-webpack-plugin": "^1.1.3",
     "highlight.js": "^9.9.0",

src/components/mdSpinner/mdSpinner.vue

@@ -2,7 +2,7 @@
   <transition name="md-spinner" appear>
     <div class="md-spinner" :class="[themeClass, classes]":style="styles">
       <svg class="md-spinner-draw" viewBox="25 25 50 50">
-        <circle class="md-spinner-path" cx="50" cy="50" r="20" :stroke-width="mdStroke" :stroke-dasharray="dashProgress">
+        <circle class="md-spinner-path" cx="50" cy="50" r="20" :stroke-width="mdStroke" :stroke-dasharray="dashProgress" />
       </svg>
     </div>
   </transition>