Github oauth: redirect_ui mismatch
Hey,

I'm using grant for github auth in my app and the redirect uri seems to equal `myapp.com/connect/github/callback&state=` instead of `myapp.com/connect/github/callback`.

Here's my config:

``` js
{
    server: {
      protocol: 'http'
    , host: 'http://myapp.org'
    }
  , github: {
      key: 'key'
    , secret: 'secret'
    , scope: []
    , callback: '/login_github_callback'
    }
  }
```
