transfer/migrater previous data when you add features to the contract

[joshpitzalis]

• https://medium.com/@mikecalvanese/flexible-upgradability-for-smart-contracts-9778d80d1638

• https://blog.aragon.one/library-driven-development-in-solidity-2bebcaf88736

• https://medium.com/aigang-network/upgradable-smart-contracts-what-weve-learned-at-aigang-b181d3d4b668

• https://gist.github.com/Arachnid/4ca9da48d51e23e5cfe0f0e14dd6318f

• https://solidity.readthedocs.io/en/develop/contracts.html#libraries

• http://solidity.readthedocs.io/en/develop/introduction-to-smart-contracts.html#delegatecall-callcode-and-libraries

• http://martin.swende.se/blog/EVM-Assembly-trick.html

• https://blog.colony.io/writing-upgradeable-contracts-in-solidity-6743f0eecc88

• https://medium.com/rocket-pool/upgradable-solidity-contract-design-54789205276d

• https://blog.zeppelin.solutions/proxy-libraries-in-solidity-79fbe4b970fd

• https://blog.zeppelinos.org/smart-contract-upgradeability-using-eternal-storage/

• https://github.com/levelkdev/upgradable-dapp-toolkit

• https://ethereum.stackexchange.com/questions/2404/upgradeable-smart-contracts?noredirect=1&lq=1

• https://medium.com/@nrchandan/interfaces-make-your-solidity-contracts-upgradeable-74cd1646a717

• https://www.youtube.com/watch?v=naqnod2XDJY

• https://medium.com/rocket-pool/upgradable-solidity-contract-design-54789205276d

[joshpitzalis]

https://github.com/joshpitzalis/mitosis/pull/28