Update dev dependencies

 extract-text-webpack-plugin@^0.5.0
 should@^5.2.0

Author: jhnns

package.json

@@ -13,11 +13,11 @@
   "devDependencies": {
     "css-loader": "^0.9.1",
     "enhanced-require": "^0.5.0-beta6",
-    "extract-text-webpack-plugin": "^0.3.8",
+    "extract-text-webpack-plugin": "^0.5.0",
     "less": "^2.3.1",
     "mocha": "^2.0.1",
     "raw-loader": "^0.5.1",
-    "should": "^4.4.1",
+    "should": "^5.2.0",
     "webpack": "^1.1.8"
   },
   "repository": {