The default is ruby 2.0.0.
Enable rubocop.
Update README.md
The default rake task kicks rspec, cucumber and rubocop.
Refactoring.
Enable Travis CI.
Add trema prerequisites for Travis.
Fix 'Missing utf-8 encoding comment' error (1.9.3)
kadai to show hosts
Merge branch 'develop' of https://github.com/shoheifujii/ruby_topology into develop