BREAKING CHANGE: KeyValuePair<,> is really confusing for talking about hashes and sorted sets; this fixes that, but changes the API

Only flush the output on a completely no-op call to WriteQueue; if work is done, but it back in in the work-queue and retry; this adds a tiny tiny delay, but is enough to help reduce packet fragmentation from high-perf producers

Minor API break: the longer RandomKey sits there, the longer it gnaws at my soul as an odd exception to the naming rules; best to fix now

Fix: Null RedisValue from boolean value

When implicit cast a boolen value into RedisValue the valueBlob was
setted to null.

Update KeysValues.md