I debug and find when with 
```
quiet: true
```
will result `[Notice] Using configuration in /var/folders/n0/k211nbwn2l18t1kmvmrpcth00000gn/T/config20130502-11820-1utv5px`

and 
```
:quiet: true
```
is ok

because the prev one produce `options["quiet"] = true` and the after one produce `options[:quiet] = true`

In my opinion, the prev one is more normal, do you agree?

I add two test to reproduce the case and will cover the bug #300