Update bower main to inclue MD for modulizer conversion

bower.json

@@ -5,7 +5,10 @@
     "Vaadin Ltd"
   ],
   "description": "vaadin-dialog",
-  "main": "vaadin-dialog.html",
+  "main": [
+    "vaadin-dialog.html",
+    "theme/material/vaadin-dialog.html"
+  ],
   "keywords": [
     "Vaadin",
     "vaadin-dialog",
@@ -24,7 +27,7 @@
   ],
   "dependencies": {
     "polymer": "^2.0.0",
-    "vaadin-overlay": "vaadin/vaadin-overlay#^3.1.0-beta1",
+    "vaadin-overlay": "vaadin/vaadin-overlay#^3.1.0-beta2",
     "vaadin-themable-mixin": "vaadin/vaadin-themable-mixin#^1.2.1",
     "vaadin-lumo-styles": "vaadin/vaadin-lumo-styles#^1.1.0-beta1",
     "vaadin-material-styles": "vaadin/vaadin-material-styles#^1.1.0-beta1",
@@ -34,7 +37,7 @@
     "iron-component-page": "^3.0.0",
     "iron-demo-helpers": "^2.0.0",
     "iron-test-helpers": "^2.0.0",
-    "vaadin-button": "vaadin/vaadin-button#^2.1.0-beta1",
+    "vaadin-button": "vaadin/vaadin-button#^2.1.0-beta2",
     "webcomponentsjs": "^1.0.0",
     "web-component-tester": "^6.1.5",
     "vaadin-demo-helpers": "vaadin/vaadin-demo-helpers#^2.0.1"