Adds PHP 5.5 for travis-ci tests
Revert "Adds PHP 5.5 for travis-ci tests"

This reverts commit e5a11f950e58bd916a01668ad68c623fa84224f1.
Adds possibility to inject URLs from the application into the service providers

Enables redirects for internal target pages, e.g. the confirmation or the order update page
Merge pull request #324 from nsendetzky/master

Adds possibility to inject URLs from the application into the service providers