Revert "Upgrade to django 1.6.4 (bug 1005911)"

This reverts commit ee1c2fae26cb48fb2335b0b0c742214026e4a0fc.
Support multiple pay acct. in lookup (bug 1005261)
Merge pull request #2054 from kumar303/multi-lookup

Support multiple pay acct. in lookup (bug 1005261)
Update SellerBoku in Solitude (bug 1002767)

- Check if a SellerBoku for a SellerProduct exists
- If it doesn't, create it
- If it does, update it
- If there are more than one, log and raise an exception
- Tests