Require fix

Hey, I think I've got it working. Took some playing around, but I noticed that in the console, Gem.loaded_specs['rspec'] is nil in rspec-rails >= 2.12. I just swapped out 'rspec' for 'rspec-core' and it seems to have fixed it. I also tried it with 2.11 and it worked. Let me know how it goes, I'll be playing with it some more and will get in touch if I notice any problems.