[travis] add bundler setting
[travis] Add 'libicu-dev'
[travis] using install key.
[travis] change before_script
[travis] copy application.yml
[travis] modified setting.
Merge branch 'feature/travis_setting' into develop
[coveralls] add setting yaml
[coveralls] add gem coveralls
[coveralls] change spec_helper.
Add gem 'simplecov'
Merge branch 'feature/coveralls' into develop