Merge pull request #49 from felixsoum/frontend-dev

Frontend dev
Merge pull request #50 from felixsoum/backend-dev

Backend dev
Merge branch 'frontend' into backend
Merge pull request #51 from felixsoum/backend

Integrate backend and frontend into master
Add XmlHelper and ZipHelper
Merge pull request #52 from felixsoum/helper

Add XmlHelper and ZipHelper
Remove duplication
Merge branch 'helper'