icon requests: lavarel folders

[Yohann Boniface]

Laravel is the biggest php framework, but some folder haven't icon yet.
Here's the list:

• bootstrap A folder that contain the app base
• seeders A folder that contains the database declaration in order to create it
• storage Runtime back-end storage (upload content / sessions / ...)
• sessions A folder that store the session values
• testing A dev testing folder

laravel repo