The access level path control used by dufs has two disadvantages:
1. One path cannot support multiple users
2. It is very troublesome to set multiple paths for one user
So it needs to be refactored.
The new auth is account based, it closes#207, closes#208.
BREAKING CHANGE: new auth
* some small css fixes and changes
* added basic auth
https://stackoverflow.com/a/9534652/3642588
* most tests are passing
* fixed all the tests
* maybe now CI will pass
* implemented sigoden's suggestions
* test basic auth
* fixed some little things