Try fix migration failure from 2.5.1
Don't migrate when db is closed
Always reconnect Transmission. fix #3631
Update nzbgeek api url
Add bd50 torrentleech
Transmission failed to download
Update log post text
Update contribute
Merge branch 'develop' of github.com:RuudBurger/CouchPotatoServer into develop
Update contributing.md
Better message
Merge remote-tracking branch 'ruud/develop' into develop

* ruud/develop:
  Better message
  Update contributing.md
  Update contribute
  Update log post text
  Transmission failed to download
  Add bd50 torrentleech
  Update nzbgeek api url
  Always reconnect Transmission. fix #3631
  Don't migrate when db is closed
  Try fix migration failure from 2.5.1