Delete unused files

Remove useless javascript code
Merge branch 'master' of https://github.com/vpoulain/alveolus-frontend
Merge branch 'master' of https://github.com/vpoulain/alveolus-frontend
Merge branch 'master' of https://github.com/vpoulain/alveolus-frontend
Merge branch 'master' of https://github.com/vpoulain/alveolus-frontend
Merge branch 'master' of https://github.com/vpoulain/alveolus-frontend
Merge branch 'master' of https://github.com/vpoulain/alveolus-frontend
Merge branch 'master' of https://github.com/vpoulain/alveolus-frontend
Simplify call API featured app + categories

Replace 1 call for get all category + 1 call for get app featured each click by on big call getting all category with 3 featured web apps :
categories/featured_webapps
It will be also profitable for WebappListCtrl (caching)