New workflow for handling genesis is proposed as follows:

1. someone generates the starting genesis.json file: i.e. gaiad init
2. genesis accounts are injected manually
3. potential validators look at it, then sign gentx to say that they want to become a genesis validator and submit it, i.e. gaiad gentx
4. once they’re gathered, the genesis.json is updated with gaiad collect-gentxs
5. everyone gets the updated genesis.json file and they run it with gaiad start

Discussed with @jaekwon. CC'ing @cwgoes @jackzampolin @zmanian

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