W3 Total Cache Pro 2.8.0

Fix: Minify: Do not remove quotes around meta tags
Fix: Minify: Removal of spaces in calc function was breaking CSS
Fix: Browser Cache: Query string was not added to prevent caching after setting changes
Fix: Avoid warning when sending an empty URL for purging
Update: Added a filter for minified JavaScript content
Update: Minify: Added options for minify only got both JS and CSS in auto mode

Fix: Fixed Memcached flush logic
Fix: Remove disk enhanced rewrites when disabling page cache
Fix: Better handle conflicts on activation

Feature: Added TransparentCDN full-site delivery option
Fix: Update settings on activation in a changed environment
Fix: Fixed a compatibility check for Apache when PHP is running as CGI
Fix: Always set HSTS headers in Apache; not only for 2xx HTTP codes
Fix: Implemented anatomic incrementing of key version in Memcache(d)
Update: Allow filtering of w3tc_minify_url_for_files Minify URL for files