Setup Code Climate

- Add badge to README
- Integrate coverage report w/ codeclimate-test-reporter using TravisCI
- Run test with Ruby 2.1 on CI
> I would say it's probably best practice to keep this kind of thing secret, but because of its limited capabilities, it's also not a huge problem should it leak out.

なのでビミョウなところですね。あまり手をかけずにいい感じにやるとすると、どうすればいいんでしょうか。
なにかアイディアあります??