GT Performance 1.0.0-rc.6

Fixed

• Fixed "Remove WordPress version" pinning every visitor to pre-update core assets. Dropping ver from a core script or stylesheet URL leaves an address that never changes across a WordPress release, so browsers and CDNs holding it under a long max-age keep serving the old bytes indefinitely. The version is now replaced with a stable site-specific hash instead of removed, which hides the release just as well and still busts the cache on every update. Symptom on a 7.1 upgrade: the new admin bar site icon rendered at full size because the cached stylesheet predated the .site-icon rules.