Pre requis (#74)

[laurentlp]

Before submitting a pull request, make sure you have:

• [X] Read the README
• [X] Searched the bugtracker for similar issues including closed ones
• [X] Reviewed the sample code in tests

Purpose of your pull request?

• [X] Bug fix (encountered problems/errors)
• [ ] Feature (request of a new functionality)
• [X] Enhancement
• [ ] Other

Complete and detailed description of your PR

Ajout de l'upload par buffer de quelques ko pour ne pas embourber la RAM et risquer de faire planter le serveur lors de l'upload de fichiers volumineux.

[coveralls]

Coverage remained the same at 52.978% when pulling 91ccd1fc2cf9aa6c80ece5ff7c548508e8ad17e7 on dev into 9495cbcdd05cc884016596c922bec3a82df16a4d on master.