[DONT MERGE YET] Feature/request all

Rebase of poupotte/feature/request-all on current master for tracking

Todo : 
- [ ] check on a normal cozy if this works / is efficient
- [ ] check tests pass
- [ ] breaks cozy-fixtures, fix cozy-fixtures or here
- [ ] remove nodetime & v8-profiler
- [ ] re-run travis on all apps after merging to ensure this doesn't break any app