Added a way to modify the oauth_callback url

[scottsampson]

If you add the following to your config options the callback url will take you back to the /users page of your project and then work with devise.

twitter.consumer_secret = <YOUR CONSUMER SECRET>
twitter.consumer_key  = <YOUR CONSUMER KEY>
twitter.options({
  :site => 'http://twitter.com',
  :oauth_callback => (BASE_URL.end_with?('/') ? BASE_URL[0..-2] : BASE_URL)  + '/users',
  :oauth_callback_confirmed => 'true'
 })

Then set BASE_URL in your environments files. For my dev environment it would be something along the lines of:

BASE_URL = "http://localhost"