Assert that flatware is the fastest
Add fail-fast option

Completes #6
Refactor: Introduce checkpoint handler
Be compatible with zmq 3
Limit worker count when running on travis
run flatware.... with flatware!
Add latest cucumber to build matrix
Make flatware work with Cucumber 1.3.1
Work with ruby 2.

Ruby 2 can't autoload from a trap context.
Cease support for cucumber 1.2
Bump version for release
Turn up logging on travis