Made PrintService not sending output directly.

- PrintService returns the PDF document as a string.
- PrintController builds a full Response object which gets then returned
- Enabled multiple prints in one process call
dtd validate added
Xml Validator (XSD) added
dtd validation added
Merge branch 'develop' into feature/WmsValidate
ordername changed
Validate into tmp added
Merge branch 'develop' into feature/WmsValidate
DIRECTORY_SEPARATOR added
fixed syntax errors
added travis.yml
added a couple of script lines to add a mb starter
run phpunit with proper parameters
trying to find the proper directory
run composer install
copy parameters.yml
added coveralls run to travis.yml
added missing space
use dev composer install
fixed path to coveralls binary