db/GroupManager.js: factored out a variable
db/GroupManager.js: factored out a variable

Extracted from Ray's work.

aptivate/etherpad-lite,storytouch/etherpad-lite,aptivate/etherpad-lite,storytouch/etherpad-lite,ether/etherpad-lite,joequant/etherpad-lite,joequant/etherpad-lite,joequant/etherpad-lite,storytouch/etherpad-lite,aptivate/etherpad-lite,joequant/etherpad-lite,ether/etherpad-lite,aptivate/etherpad-lite,ether/etherpad-lite