Add option for FLUSHDB

[Foxboron]

Using this at work and currently need the ability to flush the connected DB. I see it's implemented in the redis library used by sol-redis-pool but i don't see anyway to try and hack around the store to access the option.

I'd love and appreciate if this option could be implemented.

[jkernech]

Thanks @Foxboron.

flushdb() may be a bit extreme if you end up storing something else in redis and unfortunately, node-redis does not support pattern deletion, e.g del('sess:*')

I will implement this feature in the near future.

[Foxboron]

Thank you!
I'm aware it's a little bit extreme. But in my case, its what i need.

Love the quick response! Keep up the work.