disable round-robin cluster scheduling
disable round-robin cluster scheduling

The cluster master process is occasionally crashing due to internal
messaging problems. According to an open node.js issue, disabling
round-robin scheduling might help (and the way we are using the cluster
module, RR does not provide any benefit anyway).

Closes #142
Fixes trello#118 https://trello.com/c/JUVeIsdu

reversefold/eleven-server,ElevenGiants/eleven-server,KaiyonAlatar/eleven-server,ElevenGiants/eleven-server,ElevenGiants/eleven-server,Mexiswow/eleven-server,Whizy/eleven-server,Whizy/eleven-server,Mexiswow/eleven-server,KaiyonAlatar/eleven-server,reversefold/eleven-server,yelworc/eleven-server,KaiyonAlatar/eleven-server,yelworc/eleven-server,Whizy/eleven-server