Fix Travis build issues (#21)

* fix(travisBuild): Updating webpack to latest as it should work fine with Node LTS and the version we were using was not

* fix(travisBuild): Updating webpack-cli and webpack-dev-server to latest

* This reverts commit 9a398c0.

* Revert "fix(travisBuild): Updating webpack to latest as it should work fine with Node LTS and the version we were using was not"

This reverts commit 0cb8cdc.

* fix(travisBuild): Locking the nodejs version on 9 as LTS is now v10 and v10 is not working correctly with webpack

.travis.yml

@@ -1,7 +1,7 @@
 language: node_js
 
 node_js:
-  - "lts/*"
+  - "9"
 
 addons:
   chrome: stable