Simply extends Jenkins' simple security to remove the CAPTCHA check.
- Probably should deprecate this plugin and roll into the core security, but I didn't want to try and touch the core since it's "security".
- If this can't be rolled into the core security, then at least the core should be tweaked to be more extensible - e.g. make about 5 methods protected instead of private. The problem with that is then this plugin would depend on the very latest core, which is okay since Jenkins warns you not to upgrade.