title: silverstripe - file permissions for assets folder
body: <p>it happens often that an silverstripe installation does not have the right permission to write in the assets folder - e.g. for saving resampled images...</p>
  
  <p>I wonder what is the best permissions setting for the files and folders in assets/ to solve that problem. 
  you read so many different things when you google...</p>
  
  <p>can I just chmod the whole assets folder and its contents to 0777?
  or do files and folders need different permissions?
  is there an recommendation for Owner and Group?
  can I have "dangerous" settings? </p>