bump loggregator

28e12e1 Metron accepts and records counter event types.
6f8e5b0 bump dropsonde (add CounterEvent support)
ed65d15 bump dropsonde
9d34ad3 Revert "add stopChan to storeWatcher.Run()"
cf035a4 bump loggregatorlib
ea742e8 add stopChan to storeWatcher.Run()
a5eb261 bump loggregatorlib