Update devDependencies

- css-loader@^0.23.1
- extract-text-webpack-plugin@^1.0.1
- less@^2.6.1
- mocha@^2.4.5
- should@^8.3.0
- webpack@^1.12.14

Author: jhnns

package.json

@@ -11,14 +11,14 @@
     "less": "^2.3.1"
   },
   "devDependencies": {
-    "css-loader": "^0.9.1",
+    "css-loader": "^0.23.1",
     "enhanced-require": "^0.5.0-beta6",
-    "extract-text-webpack-plugin": "^0.5.0",
-    "less": "^2.3.1",
-    "mocha": "^2.0.1",
+    "extract-text-webpack-plugin": "^1.0.1",
+    "less": "^2.6.1",
+    "mocha": "^2.4.5",
     "raw-loader": "^0.5.1",
-    "should": "^5.2.0",
-    "webpack": "^1.1.8"
+    "should": "^8.3.0",
+    "webpack": "^1.12.14"
   },
   "repository": {
     "type": "git",