DDF-660: Disable persistence for anonymous users

This is an immediate and short-term means to disable persistence for anonymous
users. The anonymous handler is currently being re-worked and this change will
be replaced with an entirely new method of handling anonymous users.
Revert IntelliJ IDEA automatic import condensation

Reverted IntelliJ IDEA's replacement of explicit imports with "java.io".
Merge pull request #17 from michael1nguyen/master

DDF-660: Disable persistence for anonymous users