Delete phpass test script.

Potentially the functions from this script could be restored in the form of PHPunit tests, but I don't know if its necassary.
Restore the Concrete5_Model_User::encryptPassword function. It is now a thin wrapper
around phpass's HashPassword function.
Merge branch 'use-phpass' of https://github.com/bdsl/concrete5 into bdsl-use-phpass
formatting
Merge branch 'bdsl-use-phpass'