Preprocessor

Pull request #26: Develop

Merge in EOSC-RS/preprocessor from develop to master

* commit 'b5a4cfd4f7a34e554e05ac6b27c3603de901468e': (38 commits)
  RS-428 Dumps.md and README.md updated - more about generating pseudo schemas for SS dumps
  RS-409 Dumps.md updated - more information about relations taken from search service
  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-418 "Metrics with Graphite" added to SYSTEM_DESIGN.md
  RS-320 updated introduction in README.md
  RS-419 "extended diagnostics" added to TODO.md and Diagnostics.md
  RS-418 section "The Tests" in LoadTesting.md and tests listed in TODO.md
  RS-418 added LoadTesting.md that describes assumptions/design of the load tests implementation
  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"
  ...