Merge pull request #44 from nikhan/master

LARGE BLUE DIAMOND
Merge pull request #45 from nikhan/master

date_in fix and adding websocket block
edit to bunch-by
tiny logging change
don't totally fail if the key being monitored isn't there
small logging update
made demux not break on missing key, and removed some excessive logging from count
sum by key block ftw
bit of logging in utils, new basic filter block
added a 5s delay for empty queues
changed the delay from 5ns to 5s (oops)
introduced the delay to the sum
Nik is such a hater
Merge pull request #48 from mikedewar/master

:clap: :clap: :clap:
Merge branch 'master' of https://github.com/nytlabs/streamtools
adding filter valye by set membership