added rule to skip caching 404s in vcl
WordPress-Varnish UserAgent as per ticket #23
document use of mod_rpaf or code fix for remote IP, Ticket #36
Clean data rather than reject to fix ticket #31. Should do validation in JS, this fixes the problem the wrong way
added plugins_loaded hook to fix ticket #12
bump version number to 0.4, update readme changelog
Merge pull request #37 from cd34/master

Combination of fixes, documented below