Spelling corrected for Chilean Spanish

Corrected some misspelled words
Thanks to @ricardoaandres for the Chilean version =)

Fixes #373
Every single appearance of the verb "coger" was misspelled. Corrected them to the right spelling.

Fixes #374
Update zh-CN.yml
Update test environment and doc.

- Bump rails_i18n from 0.7.3 to 4.0.1
- Bump dev dependencies and move them to gemspec.
- Removed 2 year old capybara connection hack and re-introduced
database_cleaner.
- Update spec syntax.
- Update README.
- Use .add_routes
- Add badges for Travis and Code Climate.