Increase Aruba process timeout

Seems like 5 seconds isn't enough on CI:
https://travis-ci.org/vcr/vcr/jobs/37566372
Don't fail the CI build if simplecov segfaulted. It happens often
Compatibility with Ruby 1.8 and Rubygems 1.6
Add `script/test` for running individual files/directories
Enable Travis folds in CI output