Optional CSRF protection for zope.formlib. There're a few issues
still to discuss.
Set the cookie path.
Fixed tests for Python-3. Small fix in the cookie value for Python-3.
comment cosmetics
csrf-error view
Rudimentary test for the invalid csrf token error view.
Merge pull request #4 from janwijbrand/csrfprotection

CRSF Protection in zope.formlib