Resources for account abstraction

[s1na]

As mentioned in #23, the research being done on account abstraction could be quite relevant to meta transactions. This issue tracks the resources on the topic. Please feel free to add stuff :)

Roughly in chronological order:

• EIP-86
• Tradeoffs in Account Abstraction Proposals
• EIP-859
• A recap of where we are at on account abstraction
• Account Abstraction Radically Simplified