Merge pull request #7 in M8A/github-views from develop to master

* commit 'c6b6de242769bf4d65d3127f3110867749bdae4f': (38 commits)
  Added forks delta in migration script; Removed unused code from index.js; Fixed forks delta in cron-job.
  Removed backup 2020-08-24; moved start_fresh script into scripts folder.
  Prepare forks series in Data context. Store forks as delta.
  Promise based updaete; store new repos in object, before saving them at the end of processing, to avoid iteration steps entanglement.
  Debug.
  New implementation for database migration.
  Added variable undefine test in filter function.
  Bug fix. Adding the the created repository in de local array.
  Replaced undefined variable.
  Undefined variable replaced with the correct name.
  When a new repo is created, it should be added to the repo list, so next searches in the repos array will find it.
  Store delta for forks.
  Fiex errors after merge. Fixed Excel sheet tile rows too long.
  Created updateRepoCommits function to update a repository commits in database.
  Added commits data to the new created repository.
  Added getRepoCommits function.
  Commits can be updated only one time per day. In cronjob the update variable will be resetted to false value.
  Added commits in database Repository Schema.
  Moved file download function into utils.js
  Implemented generator run
  ...