Upgrade Editor – Slate 0.44 / RME 8.0.0 (#863)

* Upgrade Slate

* Normalization

* Remove dupe dep

* Fixes placeholders

* Image uploading fixed

* Verbose but solid placeholder handling

* RME 8.0.0

* Fixes: Ability to delete embeds

package.json

@@ -65,7 +65,6 @@
   },
   "dependencies": {
     "@tommoor/remove-markdown": "0.3.1",
-    "@tommoor/slate-drop-or-paste-images": "^0.8.1",
     "autotrack": "^2.4.1",
     "aws-sdk": "^2.135.0",
     "babel-core": "^6.24.1",
@@ -158,7 +157,7 @@
     "react-waypoint": "^7.3.1",
     "redis": "^2.6.2",
     "redis-lock": "^0.1.0",
-    "rich-markdown-editor": "^7.0.0-2",
+    "rich-markdown-editor": "^8.0.0",
     "safestart": "1.1.0",
     "sequelize": "4.28.6",
     "sequelize-cli": "^2.7.0",