allow send_event to be called from within modules

resolves the error:
  undefined local variable or method `settings'

when send_event is called from in a module

Author: zsalzbank

lib/dashing.rb

@@ -92,8 +92,8 @@ def send_event(id, body)
   body[:id] = id
   body[:updatedAt] ||= Time.now.to_i
   event = format_event(body.to_json)
-  settings.history[id] = event
-  settings.connections.each { |out| out << event }
+  Sinatra::Application.settings.history[id] = event
+  Sinatra::Application.settings.connections.each { |out| out << event }
 end
 
 def format_event(body)