fix #653, overuse of Redis KEYS in mirror
cleanup mirror logic, untested
hardcode hiredis driver for receivers
llen instead of scard for archive length
Merge branch 'master' into 653_improve_mirror_performance
more paranoid archive refreshing
when changing method args, change them *everywhere*
fix mirroring 'caught-up' state
hacky tag speedup; bring on flapjack v2 :P
add filter to event mirror
incorporate feedback from @jessereynolds
remove source redis known_keys set update from event.rb
Merge pull request #661 from flapjack/653_improve_mirror_performance

fix #653, overuse of Redis KEYS in mirror