cjb/codex-blackboard — pull request #154 by cjb (2014-12-07 17:45:31+00:00)
Title: Fix tab completion by moving whos_here() out of helpers

deb7f72cb6 ("Use Template#helpers method to define helpers.") moved
some methods away from being on the Template object to being Spacebars
helpers. But Template.messages_input.events was making a call to
Template.chat_header.whos_here() directly, and that doesn't work
after the refactor.

There wasn't any need for the cross-template method call anyway,
so just make whos_here() a utility function of chat.coffee to fix.