Automatically recurring donations

[ErikBjare]

There are a few EIPs floating around enabling proper recurring donations without user interaction. This would help reduce churn as users wouldn't actively have to donate every month if they are still happy with the allocation they last made.

• Recurring Subscription Models are a Good Thing and should be viable on Ethereum (Merit + Architecture ERC) ethereum/EIPs#948
• EIP 1337 -- Subscriptions on the blockchain. ethereum/EIPs#1337