chore(package): update webpack to version 2.3.3
chore(package): update webpack to version 2.3.3

https://greenkeeper.io/
c1rno/angelhack_frontend_prototype,c1rno/angelhack_frontend_prototype,mseemann/angular2-mdl,c1rno/angelhack_frontend_prototype,c1rno/angelhack_frontend_prototype,mseemann/angular2-mdl,mseemann/angular2-mdl,mseemann/angular2-mdl