Fix nginx closing WebSocket connection after 60 seconds (#370)

* Test

* Add keepalive

* Revert "Add keepalive"

This reverts commit 8b92198122daa0f67856d114dde26ac542d93114.

* Update dashboard.py

* Revert

* Lint

esphomeyaml/dashboard/dashboard.py

@@ -511,6 +511,12 @@ def make_app(debug=False):
                 self.set_header('Cache-Control', 'no-store, no-cache, must-revalidate, max-age=0')
 
     static_path = os.path.join(os.path.dirname(__file__), 'static')
+    settings = {
+        'debug': debug,
+        'cookie_secret': COOKIE_SECRET,
+        'log_function': log_function,
+        'websocket_ping_interval': 30.0,
+    }
     app = tornado.web.Application([
         (r"/", MainRequestHandler),
         (r"/login", LoginHandler),
@@ -527,7 +533,7 @@ def make_app(debug=False):
         (r"/ping", PingRequestHandler),
         (r"/wizard.html", WizardRequestHandler),
         (r'/static/(.*)', StaticFileHandler, {'path': static_path}),
-    ], debug=debug, cookie_secret=COOKIE_SECRET, log_function=log_function)
+    ], **settings)
 
     if debug:
         _STATIC_FILE_HASHES.clear()

esphomeyaml/dashboard/templates/index.html

@@ -409,7 +409,7 @@
     </div>
   </div>
   <div class="modal-footer">
-    <a class="modal-close waves-effect waves-green btn-flat stop-logs">Stop</a>
+    <a class="modal-close waves-effect waves-green btn-flat stop-logs">Close</a>
   </div>
 </div>