Upgrade box to v0.6.6

[PatrickAlphaC]

1. VRF doesnt work with the current truffle box (needs solc v 0.6.6)
2. Upgrade contracts to v0.6 of solidity
3. Fix the fund-contracts script - right now it just hangs due to some recent changes of metamask

[PatrickAlphaC]

Thanks @GMSteuart !