Collective-captcha

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- Disuse 'zope.testing.doctest' in favor of stdlib's 'doctest'.
[tseaver]

- Suppress 'sha' deprecation under Python 2.6+
[tseaver]

- Suppress 'Globals.package_home' deprecation under Zope 2.12+.
[tseaver]

- Add `verify` to the list of allowed attributes on the Captcha
view, allowing restricted code to verify submitted captchas.
[mj]

- Better session id generation & redundant sha1 removal.
[serhat]

- Increase captcha image specling from 0.3 to 1.5
[serhat]

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- Correctly calculate the word for the next time period. Fixes
http://plone.org/products/collective.captcha/issues/4.
[mj]

- Adjust imports for Plone 4.1 compatibility.
[redcor]

- Explicitely define 'image' and 'audio' as publishable.
[cillian]

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- Fixed http://plone.org/products/collective.captcha/issues/3.
[stefan]

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- Switched to using plone.keyring to provide the secret.

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- SkimpyGimpy now does have an egg, thanks to Reed O'Brien! Updated
installation instructions and setup.py.

- Update test to reflect reduced character set used.