1..8
# ->retrieveByUsername()
ok 1 - ->retrieveByUsername() returns null if username is invalid
ok 2 - ->retrieveByUsername() returns null if user is inactive
ok 3 - ->retrieveByUsername() returns an inactive user when second parameter is false
ok 4 - ->retrieveByUsername() returns an active user
ok 5 - ->retrieveByUsername() returns null if user is active and second parameter is false
ok 6 - ->retrieveByUsername() can be called non-statically
ok 7 - ->retrieveByUsername() does not throw an exception if username is null
ok 8 - ->retrieveByUsername() can be called statically (BC)
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