Fixed broken loading under Rails 2
Fixed broken loading under Rails 2

The railties need to be wrapped in a check for Rails 3. On Rails 2, if railties
aren't installed this would error on missing constant. If it was
installed it would complain on version mismatch.

mkrisher/oauth-plugin,houston/oauth-plugin,houston/oauth-plugin,kyberie/oauth-plugin,FundingGates/oauth-plugin,pelle/oauth-plugin,unbox/oauth-plugin,kyberie/oauth-plugin,mkrisher/oauth-plugin,FundingGates/oauth-plugin