redesign of cerebrum

Modification:

- introduce an anotation called ForeignKey. This can be use to ensure
    that the uuid reference in another entity is valid and cascading
    effect are maintained.
- modify some entities and added some new entities like Image, Person
    and Software. Also, corresponding repositories and services.
- redesign the base service and create a kind of base repository

Target: master
4 jobs for master in 1 minute and 29 seconds
Status Name Job ID Coverage
  Build
passed build #297647

00:00:47

 
  Test
failed test #297648

00:00:42

 
  Package
skipped package #297649
docker
 
  Docker
skipped docker_build_push #297650
docker
 
Name Stage Failure
failed
test Test
[ERROR] No plugin found for prefix ',"error"' in the current project and in the plugin groups [org.apache.maven.plugins, org.codehaus.mojo] available from the repositories [local (/builds/thomas.beermann/helmholtz-cerebrum/.m2/repository), central (https://repo.maven.apache.org/maven2)] -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/NoPluginFoundForPrefixException
Cleaning up file based variables
ERROR: Job failed: exit code 1