When admin delete a device, all request referred to this device must be deleted
Task #4280 At request page, Admin can update the end time of the request
Merge pull request #56 from huyen123/task#4385

When admin delete a device, all request referred to this device must be ...
Merge pull request #58 from VanGiang/task/4280

Task #4280 At request page, Admin can update the end time of the request
Task #4379 Admin can upload more than one image for each device