* Feature: (Premium) Advanced Comment Spam Filter. Checks comment source IP, author URL and hosts and IP's in body against additional spam lists. 
* Feature: (Premium) Check if your site is being Spamvertised i.e. your domain is being included in spam emails. Usually indicates you've been hacked.
* Feature: (Premium) Check if your website IP is generating spam. Checks against spam lists if your IP is a known source of spam.
* Improvement: Cache clearing errors are nown shown with clear explanations. 
* Improvement: Added lightweight stats logging internally in preparation for displaying them on the admin UI in the next release. 
* Fix: If a non-existent user tries to sign in it is not logged in the live logins tab. Fixed.
* Fix: Removed warning "Trying to get property of non-object" that would occur under certain conditions. 
* Fix: Removed call to is_404() which was not having any effect and would issue a warning if debug mode is enabled. 
* Fix: Check if CURL is installed as part of connectivity test.

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git-svn-id: https://plugins.svn.wordpress.org/wordfence/trunk@922566 b8457f37-d9ea-0310-8a92-e5e31aec5664
Forcing the repo to generate the changelog. It missed on the main checkin. 


git-svn-id: https://plugins.svn.wordpress.org/wordfence/trunk@922567 b8457f37-d9ea-0310-8a92-e5e31aec5664