Better handling of online/offline behavior, socket shutdown (#1593)

* Online/offline: Always stop timer, don't connect if closed

* Sockets: Send our own close event faster, shutdown only on close

Seems that we were too-aggressively disconnecting from all socket
events. Also, we should be able to send our own close event a lot
faster with no ill effects.

* Catch-up libtextsecure changes

libtextsecure/websocket-resources.js

@@ -182,7 +182,7 @@
                 ev.code = code;
                 ev.reason = reason;
                 this.dispatchEvent(ev);
-            }.bind(this), 10000);
+            }.bind(this), 1000);
         };
     };
     window.WebSocketResource.prototype = new textsecure.EventTarget();