Enhancement: init command genesis file w/o validator filled

[greg-szabo]

The basecoin init command should be able to generate genesis.json files that have the validator part filled (as it is now) or where the validator part is empty. (new enhancement)
This request is also opened for the tendermint app, the the solution should be the same for both. The request number will be pasted below.

Option #1: Keep as is and introduce switch:
basecoin init --not-a-validator (or similar, like --no-validator)

Option #2: Make no-validator the default and optionally fill it:
basecoin init (creates genesis.json with validator not filled basecoin init --validator` (creates genesis.json with validator filled)

I like the second option for two reasons:

1. It's better if switches add functionality than when they remove functionality.
2. Since the packaging process packages tendermint with basecoin, basecoin will not be run in-process. The validator part in the basecoin config becomes confusing and unnecessary.

[greg-szabo]

Tendermint request: tendermint/tendermint#542

[ethanfrey]

@ebuchman Do we want this? I think you have a better idea than me of how this should work for end users.

[ebuchman]

closing so it can be taken up in #324 with new design