Prepare 5.2.1 release

Prepare 5.2.0 release

Prepare 5.1.0 release

Merge branch 'develop'

* develop: (46 commits)
  updated readme
  preparation for multiple commands
  removed client stuff and added release scripts
  instant delete objects and reappear if failed
  added external client-id/secret passing
  bugfix
  fixed tests
  finalized parameters
  faster stack reading
  length check race condition
  chunk cutting / 416 error reporting
  working stuff
  tryouts
  tryouts
  error bugfix
  chunk removal
  added chunk removal
  added chunk removal
  refactoring
  bugfix
  ...

Merge branch 'develop'

* develop: (46 commits)
  updated readme
  preparation for multiple commands
  removed client stuff and added release scripts
  instant delete objects and reappear if failed
  added external client-id/secret passing
  bugfix
  fixed tests
  finalized parameters
  faster stack reading
  length check race condition
  chunk cutting / 416 error reporting
  working stuff
  tryouts
  tryouts
  error bugfix
  chunk removal
  added chunk removal
  added chunk removal
  refactoring
  bugfix
  ...

Merge pull request #213 from Marcocanc/master

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Merge pull request #213 from Marcocanc/master

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Merge pull request #213 from Marcocanc/master

Add Logo

Merge pull request #213 from Marcocanc/master

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made a flexible queue size depending on server settings