Preprocessor

Pull request #24: Sub sparkjob processing

Merge in EOSC-RS/preprocessor from sub-sparkjob_processing to feature/sparkjob_processing

* commit '68f670f499b03e7d74367e19e74b9fda6f3aa724': (36 commits)
  RS-431 generate mvn project report
  RS-430 add JMS_messages_processing-UML_diagram.md
  RS-418 Spark Job load test
  RS-418 UA load test
  RS-418 UA load test
  RS-429 job for Marketplace resources
  RS-428 dump stats
  RS-405 semi-automated Spark processing
  RS-406 add doi - OAG sparkjob
  RS-405 semi-automated OAG and trainings processing
  RS-406 add doi - OAG sparkjob
  RS-485 RS-185 semi-automated OAG processing
  RS-320 CONTRIBUTING.md - new section "Reporting Bugs and Creating Issues"
  RS-414 make token visible in TODO.md
  RS-414 update TODO.md
  RS-320 documentation restructured
  RS-414 add database reinitialization script
  RS-413 LICENSE.txt mentioned in CHANGELOG.md
  RS-413 LICENSE.txt added
  RS-409 processing relations - url to official documentation
  ...