Catch the exception while twitter service is under maintaince.

[sishen]

Sometimes twitter is under maintaince and as a result the app can't request the oauth token. We need to do something instead of directly raising the exception to the top, such as catch the exception in the SessionsController#new,

rescue Exception => e
authentication_failed("We're currently experiencing issues with Twitter's OAuth Service. Please try later.") and return

[mbleigh]

Yeah, I noticed that as well. Will work in a catch for that sometime soon.