automate the certificate renewal process

backed up head, merged all into one clean commit.

Logic: 
if (ntru defined)
    -update certs

    /* since we cannot assume the user has keygen and certgen enabled */
    -configure with ntru, keygen, certgen and run makecheck

else (if ntru not defined)
    -configure with ntru, keygen, certgen and run makecheck

    if (now defined)
        -update certs, copy and paste keys generated by running make check above

    else (if still not defined)
        -tell user to go install ntru as the purpose of this script is to update all the certs

    end if
end if