Remove material-design dependency

Author: edgarmueller

package.json

@@ -23,7 +23,6 @@
     "@webcomponents/webcomponentsjs": "^1.0.17",
     "core-js": "^2.5.1",
     "jsonforms": "^2.0.0-alpha.10",
-    "material-design-lite": "^1.3.0",
     "rxjs": "^5.5.2",
     "zone.js": "^0.8.18"
   },