www-client/torbrowser/torbrowser: remove unused eclasses
www-client/torbrowser: sync with firefox-24esr
www-client/torbrowser: use new torbrowser sources

see https://gitweb.torproject.org/tor-browser.git
www-client/torbrowser: version bump
www-client/torbrowser: restore torbrowser-17.0.11
www-client/torbrowser: update manifest, remove keywords