Update outdated packages

Author: dmitrykuzmenkov

package.json

@@ -30,8 +30,8 @@
     "css-loader": "^0.23.1",
     "domd": "^0.7.1",
     "extract-text-webpack-plugin": "^1.0.1",
-    "html-webpack-plugin": "^1.7.0",
-    "jext": "^0.3.7",
+    "html-webpack-plugin": "^2.9.0",
+    "jext": "^0.4.3",
     "jext-loader": "^1.0.4",
     "less": "^2.6.0",
     "less-loader": "^2.2.2",