chore(deps): pin extract-text-webpack-plugin version to 2.0.0-beta.5 (#152)

Higher versions require webpack 2.2+, which is not yet supported.

Author: sis0k0

package.json

@@ -56,7 +56,7 @@
         "codelyzer": "~2.0.0-beta.3",
         "copy-webpack-plugin": "~3.0.1",
         "css-loader": "~0.26.0",
-        "extract-text-webpack-plugin": "~2.0.0-beta.4",
+        "extract-text-webpack-plugin": "2.0.0-beta.5",
         "fs-extra": "^0.30.0",
         "glob": "^7.0.5",
         "lazy": "1.0.11",
@@ -106,4 +106,4 @@
         "build-android-bundle": "tns build android --bundle --disable-npm-install",
         "build-ios-bundle": "tns build ios --bundle --disable-npm-install"
     }
-}
+}