Stop by CTRL+C in "Embedding Sinatra within EventMachine" sample

The present sample does not stop when CTRL+C is pressed because the signal
is processed by thin server. Set "signals" option to false to avoid this.

Author: nota-ja

embed/event-machine.md

@@ -71,7 +71,8 @@ def run(opts)
       app:    dispatch,
       server: server,
       Host:   host,
-      Port:   port
+      Port:   port,
+      signals: false,
     })
   end
 end