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