Nearest neighbor finder

Pull request #36: Merge dev

Merge in EOSC-RS/nearest-neighbor-finder from dev to master

* commit 'dce698f94ccd87e9bbf63746763473d82a14a0be':
  added startup indexes download retries
  tag increment 1.4.2
  test update
  docs update
  minor docs fixes
  changed RESOURCE_LANGUAGES to list