Ethereum #48: Upgradable Contracts
https://blog.colony.io/writing-upgradeable-contracts-in-solidity-6743f0eecc88
https://consensys.github.io/smart-contract-best-practices/software_engineering/
https://medium.com/aigang-network/upgradable-smart-contracts-what-weve-learned-at-aigang-b181d3d4b668
https://blog.indorse.io/ethereum-upgradeable-smart-contract-strategies-456350d0557c
https://0xproject.com/wiki#Architecture
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