old_contents: from django_bitcoin.models import BitcoinPayment, getNewBitcoinPayment
  from django_bitcoin.models import BitcoinWallet
  from django_bitcoin.utils import generateuniquehash, int2base64, base642int, bitcoinprice
  
  
new_contents: from django_bitcoin.models import Payment, getNewBitcoinPayment
  from django_bitcoin.models import BitcoinWallet
  from django_bitcoin.utils import generateuniquehash, int2base64, base642int, bitcoinprice
  
  
subject: update __init__.py