Added log4j 2 to the project
* Added dependencies to pom
* Added configuration for log4j (log4j2.xml in WEB-INF)
* Added configuration for log4j to the web.xml
* Replaced sysouts with logs
fixes #14 Added an abstract service
Added the AbstractService class for the services
Merge pull request #33 from tothfn/30

Add log4j 2 to the project fixes #30

* Added dependencies to pom
* Added configuration for log4j (log4j2.xml in WEB-INF)
* Added configuration for log4j to the web.xml
* Replaced sysouts with logs
Merge branch 'master' into 14
refs #13 added a addError method to the abstract service
Changed the add error method to protected
Merge pull request #34 from tothfn/14

fixes #14 Added an abstract service
add CsarRepository wip #17
move sessionGeneration in helper-Class