lan discovery almost done

Signed-off-by: fufesou <shuanglongchen@yeah.net>

src/ui/index.tis

@@ -51,12 +51,17 @@ class RecentSessions: Reactor.Component {
         sessions = sessions.map(this.getSession);
         return <div style="width: *">
             <div .recent-sessions-title>RECENT SESSIONS</div>
+            <button .button #discover>DISCOVER</button>
             <div .recent-sessions-content key={sessions.length}>
                 {sessions}
             </div>
         </div>;
     }
 
+    event click $(button#discover) {
+        handler.lan_discover();
+    }
+
     function getSession(s) {
         var id = s[0];
         var username = s[1];