Plone.formwidget.recaptcha

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* some pep8/plone conventions code style cleanup.
[jensens]

* recaptcha API 2 (aka norecaptcha)
[mamico]

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* Register browser components for a product browser layer so they don't
leak to sites without this product installed. Run the upgrade step
if upgrading on a site that already has this product installed.
[davisagli]

* Move to plone.app.discussion-captcha feature declaration to meta.zcml.
[timo]

* Adapt recaptcha view instead of captcha view for validation.
[ramon]

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* Updated package metadata and marked this as a Plone add-on.
[timo]

* Declare that plone.formwidget.captcha provides a Captcha field that can be
used by plone.app.discussion to add a Captcha field to comment forms.
[timo]

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* z3c.autoinclude.plugin added
[timo]

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* Initial release
[timo]