When SpecInfra.configuration.foo is nil, use RSpec.configurataion.foo if RSpec is defined.
Call RSpec.configure only if RSpec is defined
Remove or substitute RSpec.configuration
Add spec to check RSpec.configuration.foo and SpecInfra.configuration.foo are same or not
Add .travis.yml
Merge pull request #2 from mizzy/remove-dependency-on-rspec

Remove dependency on RSPec