Switch over to using common_rake to build test app
Fix up spec/integration/translation_spec

I tried getting the deleted test to pass, but it appears that if you set I18n.locale to a locale that *isn't* in I18n.available_locales, but still has the loaded translations, it will still translate it.
Japanese translations don't need to be in a separate directory
Correct Japanese translation tests

Rather than using i18n-spec to ensure the completeness of a translation, we will be using localeapp
Remove locales_spec

This was causing false positives regarding match_choices keys within translations, and isn't testing much at all
Japan's translations are no longer split into separate directories