mollom 6.x-2.1

Changes since 6.x-2.0:

• #1707154 by acbramley: Fixes insecure content warning for text analysis.
• #1684916 by sun, netsensei: Fixed Audio CAPTCHA page callback throws 403 error when testing mode is enabled.
• #1617800 by jgtrescazes, sun: Fixed Option 'Block all form submissions' doesn't work.
• #1606418 by sun: Added back a link to Mollom on the image CAPTCHA that explains what it is.
• #1249284 by sun: Clarify which fields to enable for text analysis and which not.
• #1598946 by jgtrescazes, sun: Fixed Audio captcha doesn't work in IE 8 on an SSL page.
• Revert "- #1493118 by sun: Fixed Invalid CAPTCHA URL when testing mode is enabled."
• #1551424 by sun: Fixed testing mode may unset API keys and save them.