You can clone with
HTTPS or Subversion.
Spork loads the Rails environment, then forks. But sometimes the Rails environment changes (e.g. a change to environments/test.rb), leading to mistaken and irritating errors on the next test run. Spork should be smart enough to notice this and either gracefully exit or forcibly restart.
Guard-Spork and Rerun both noticed this problem and provide solutions, but it would be nice if Spork managed this on its own.