OriginTrail Vostok release v2.0.50

The v2.0.50 release includes additional support for node connectivity with Ethereum and improvements in the bidding mechanism.

The updates in particular:

• Explicitly require personal Ethereum RPC (#875)
• Autoupdate patch (#883)
  Autoupdate patched to run during startup of the docker and blocks util it is finished. Also, node will check for updates regularly.
• Miner distribution fix (#887)
  Fixes miner to even distribution of won jobs.
• Add paid amount requirement in Holding contract (#889)
• Fix downloading NaN (#890)
  Do not show 'Downloading NaN' to the console during download of the update.
• Check for transaction prices (#845) (#885)
  Fix checking for transaction price before making a transaction.