Implements method for calculating dates in the past that keeps care of weekends and public holidays
Merge pull request #323 from nsendetzky/master

Implements method for calculating dates in the past that keeps care of weekends and public holidays
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
Fixes error message and improves unique name of uploaded file
Improves content URL handling
Merge pull request #322 from cookiekiller/xml_fixes

Filters invalid UTF-8 characters in texts
Merge https://github.com/Arcavias/arcavias-core
Improves implementation for filtering text but disabled it due to unexpected output for arabic characters
Fixes syntax error
Merge pull request #325 from nsendetzky/master

Improves content URL handling
Rename function because it was renamed