Unblock

Please comment and review.
I did some testing, and this doesn't seem to be a problem. Even leaving it just as we have it, it's simply the difference between this (what it will currently do if given an error object):

```
Error: [Error: bye!]
  at gErr (/Users/gslepak/test/err.coffee:8:13)
  at Object.<anonymous> (/Users/gslepak/test/err.coffee:15:5)
  at Object.<anonymous> (/Users/gslepak/test/err.coffee:1:1)
  at Module._compile (module.js:449:26)
```
And this (if printing `err.message`):
```
Error: bye!
  at Object.<anonymous> (/Users/gslepak/test/err.coffee:14:14)
  at Object.<anonymous> (/Users/gslepak/test/err.coffee:1:1)
  at Module._compile (module.js:449:26)
```

Doesn't seem like an issue after all, we could just leave it. Thoughts?