removes unicorn group value

it makes sense for worker processes to switch their UID to an unprivileged account
after they fork but they should not change their GID. this will ensure
that any files they create honor the effective GID of the parent dir that
contains them.
updates deployed code permissions

now root path with enforce an effective GID for all subdirs/files created inside
it. log files are made group writable after server start.
metadata bump