Proposal for a new level [33] [BankBuilder].

[orangesantra]

• BankBuilder is the contract used to deploy Bank Contract. When BankBuilder instance is created, Bank contract is also
  deployed with 0.001 ethers.

• Bank Contract can deploy Recipient contract.

• Bank Contract has grouped the list of 10 addresses of different Recipient contracts in order, but not deployed yet. The address
  of Recipient contract to be deployed first is at position no. 1 on list, the address to be deployed second is on position no. 2 on
  list and so on.

• Accidently when Bank Contract is deployed all the funds in Bank Contract is transferred to 5th Recipient address.
  Now the funds are stuck on 5th Recipient address.

The Goal is to retrieve the funds back to BankBuilder contract !

[orangesantra]

Concerned openzeppelin team, please suggest the improvements in PR , so i can work on them.