Update dependencies

package.json

@@ -15,7 +15,7 @@
     "babel-preset-env": "^1.6.0",
     "leaflet": "^1.2.0",
     "lodash": "^4.17.4",
-    "material-ui": "next",
+    "material-ui": "npm:material-ui@next",
     "material-ui-old": "npm:material-ui@latest",
     "mdi": "^2.0.46",
     "mqtt": "^2.14.0",

types/types.js

@@ -15,7 +15,7 @@ declare type Topics = Map<string,Topic>;
 
 declare type UIBase = {
   text: string,
-  topic: string,
+  topic?: string,
   icon?: string, 
   enableCondition?: (internal: string, actual: any, state: State) => boolean
 }