functions: performance improvements - LRU & singleflight DB calls (#322)

* functions: add cache and singleflight to ease database load

* runner: upgrade

* deps: upgrade glide files

* license: add third party notifications

* functions: fix handling of implicitly created apps

* functions: code deduplication

* functions: fix missing variable

main.go

@@ -76,6 +76,7 @@ func main() {
 	}
 
 	svr := &supervisor.Supervisor{
+		MaxRestarts: supervisor.AlwaysRestart,
 		Log: func(msg interface{}) {
 			log.Debug("supervisor: ", msg)
 		},