Acl creation

[ClaraMirandaGarcia]

Feature description

An acl with the pertinent permissions should be created when creating a folder or a file.

Acceptance criteria

• [x] Create an acl for a normal folder
• [x] Create an acl for an inbox
• [x] Create an acl for a file for media

[ClaraMirandaGarcia]

• Adding the acl to the folders initially created: 0f9cce9 .
• Fixed error 403 when adding content: 8a876c0 .