Use IP service for session fixation test
Use ip service for session fixation test
Unused use statement
Close #1548
Callback response honouring.

Modifies the ClosureRouteCallback to properly honour responses from
callbacks which are Response objects. At the moment they are cast to
string and returned as a new Response objects content.
Merge pull request #1655 from ExchangeCore/session-fixation

Session fixation IP address check
Merge pull request #1659 from olsgreen/closure-response-honouring

Callback response honouring.
Remove DIR_REL from \URL::to calls in authentication files