Consider making Redis an optional API dependency

[JonCook]

Hi,

It seem Redis is now a mandatory dependency in order to run a helioviewer API? Reviewing index.php

$redis = new Redis();
$redis->connect(HV_REDIS_HOST,HV_REDIS_PORT);
$rateLimiter = new RateLimit\RedisRateLimiter($redis,$prefix);

It seems it always connects despite the value of HV_ENABLE_STATISTICS_COLLECTION and HV_ENFORCE_RATE_LIMIT

For providers who don't wish to enable stats collection and enforce rate limiting in this way - could it be possible to switch it off all together?

Thanks
Jon

[dgarciabriseno]

We can look into creating a config option to disable Redis.