Added configuration options for setting-up guest captcha for issue reporting and posting comments. Related to issue #2352.
Added guest captcha to issue reporting page, comment posting, and comment replying. Related to issue #2352.
Smal fixes for docs (issue #2352).
Fix rendering of captcha table when reporting issues. Add captcha to available fields if guest is accessing and guest captcha has been enabled. Issue #2352.
Merge pull request #303 from azaghal/branch-32-2352

Implementation for guest captcha for reporting issues and posting new commments