Increased contrast of console log messages.

I think this is easier to see in the console:

```
---***---  persistState events ---***---
 []
---***---  applyEffect ---***---
 { created: [],
  sent: [ { message: [Object], context: [Object] } ] }
---***---  persistState effect ---***---
 { created: [],
  sent: [ { message: [Object], context: [Object] } ] }
---***---  persistState events ---***---
 []
---***---  bufferReadyBeh ---***---
 { message: { type: 'balance', ok: [Function: send], fail: [Function: send] },
  context: 
   { self: [Function: send],
     state: { balance: 42 },
     behavior: 'function accountBeh(message) {\n    console.log(\'account:\', message);\n    if (message.type === \'balance\') {\n        // { type:\'balance\', ok:, fail: }\n        message.ok(this.state.balance);\n    } else if (message.type === \'adjust\') {\n        // { type:\'adjust\', amount:, ok:, fail: }\n        var balance = this.state.balance + message.amount;\n        if (balance >= 0) {\n            this.state.balance = balance;\n            message.ok(this.state.balance);\n        } else {\n            message.fail({\n                error: \'Insufficient Funds\',\n                account: this.self\n            });\n        }\n    }\n}',
     sponsor: [Function: create] } }
```