Correct typo in README

The error class listed in the README was incorrect.
Merge pull request #78 from techpeace/patch-1

Correct typo in README
Link to specific version of SemVer
Remove pipelines
Add helper method for merging errors
Get basic interruption working
Add basic integration test
Fix Travis build configuration

See travis-ci/travis-ci#1641.
Add rubysl gem to Rubinius

Fixes the build in Travis. See 152f302.
Add rubinius-coverage gem

Hopefully this will fix the build for real.
Fix conditional

D'oh!
List an exact version of Rubinius
Add Vagrant configuration
Fix Vagrantfile
Merge branch 'master' into compose
Simplify Base#interact
Add comments explaining empty rescue blocks
Use valid YARD
Ignore unused parameter
Change key to a symbol

This used to be a string because of with_indifferent_access, but that's
not necessary any more.