First draft of fungible token standard (following ERC-20).

[anorth]

This proposal provides a standard API for the implementation of fungible tokens within smart contracts.
This proposal is an adaptation of Ethereum's ERC-20 for the Filecoin VM.

Discussion topics:

• Fungible token standard (ERC-20 for Filecoin) #277 for discussion of the content of this proposal
• Defining contract standards for Filecoin #279 for meta discussion about the form of this proposal: how we should propose token standards in general

cc @raulk @Stebalien

[anorth]

After sitting with this idea for a while and learning more about similar standards both in Ethereum and other ecosystems, I no longer think that following ERC-20 this closely is a good idea. We have an opportunity to take the lessons from years of experience subsequent to the adoption of the early Ethereum standards and apply them to a relatively clean slate.

I'm going to withdraw this draft, but continue discussion toward better standards. FYI @nicola @Kubuxu @raulk.