Make a model 'Filesys'. (not yet, because of uploader field)
If user is loginned already, redirect to home.
Made the model of Filesys. /iss002
Merge branch 'iss002' into feature/filesys
Make back-end for file listing /iss007 __1, __2, __3
__1/For directory, make a checking function for URL.
__2/Validate URL in models.py with Model.clean() function
__3/For /root/* path, all paths call the storage.views.filesys()