Spies forward -isEqual and -hash to the original object
Updates rake file to build against iOS 7.1

Runs iOS specs against 7.0, so 7.0 simulator is required
Merge pull request #197 from akitchen/master

Updates rake file to build against iOS 7.1
Merge pull request #198 from pivotal-brian-croom/spies-value-equality

Spies forward -isEqual and -hash to the original object