WK-445 Changed handling of response

SOAPClient does only return stdClass which is not serializable by JMS Serializer. So I use convert it to an aarray now
WK-445 Fixed all test errors
WK-445 Updated documentation
WK-445 Formatted
WK-445 Fixed travis error caused by a wrong annotation
WK-445 Fixed psr-4
WK-445 Updated dependencies
WK-445 Added symfony finder as a dependency
WK-445 Updated dependencies for web test case
Merge branch 'develop'