Upgrade to Webpack 2.x    - upgrade travis node to latest stable
Upgrade to Webpack 2.x
   - upgrade travis node to latest stable

#2094

kamransaleem/waltz,khartec/waltz,davidwatkins73/waltz-dev,khartec/waltz,khartec/waltz,kamransaleem/waltz,rovats/waltz,khartec/waltz,davidwatkins73/waltz-dev,davidwatkins73/waltz-dev,davidwatkins73/waltz-dev,rovats/waltz,rovats/waltz,kamransaleem/waltz,kamransaleem/waltz,rovats/waltz