implemented abstract getById action
extracted more stuff from concrete to abstract rest controller
refactored entity to entityName
added new lines to files
added search functionality to list
corrected check in processPut
recode review & cleanup
Merge branch 'feature/abstract-rest-controller' of https://github.com/massiveart/SuluCoreBundle into feature/abstract-rest-controller
Merge branch 'feature/abstract-rest-controller' into develop