Refactor RateLimiter so that if Redis is not running, everything still runs normally (minus the rate limiting protection). My assumption that creating a Redis connection would throw an exception if Redis wasn't running was wrong. The exceptions actually occur when you issue a command. This is for #224.

#downloads-add td {
    padding-bottom: 5px;
}

#downloads-add fieldset {
    margin: 1em 0 1em;
    padding: 0.5em;
}