0.2.0
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- Added file cache, can setup how many images you want generate by `config.cache_limit`,
  RuCaptcha will use cache for next requests.
  When you restart Rails processes it will generate new again and clean the old caches.

0.1.4
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- Fix `verify_rucaptcha?` logic in somecase.
- Locales fixed.

0.1.3
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- `zh-TW` translate file fixed.
- Use xxx_url to fix bad captcha URL for `config.action_controller.asset_host` enabled case.

0.1.2
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- No case sensitive;
- Export config.implode;
- Improve image color and style;
- Don't generate chars in 'l,o,0,1'.
- Render lower case chars on image.

0.1.1
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- Include default validation I18n messages (en, zh-CN, zh-TW).

0.1.0
-----

- First release.