Remove unused dependencies (#1796)

* Remove unused slate-sugar

* Remove unused dependencies

package.json

@@ -19,7 +19,6 @@
     "copy-webpack-plugin": "^4.4.1",
     "cross-env": "^5.1.3",
     "css-loader": "^0.28.9",
-    "disc": "^1.3.2",
     "eslint": "^4.16.0",
     "eslint-config-prettier": "^2.9.0",
     "eslint-plugin-import": "^2.8.0",
@@ -27,7 +26,6 @@
     "eslint-plugin-react": "^7.6.0",
     "extract-text-webpack-plugin": "^3.0.2",
     "faker": "^3.1.0",
-    "fbjs": "^0.8.3",
     "fs-promise": "^1.0.0",
     "gh-pages": "^0.11.0",
     "html-webpack-plugin": "^2.30.1",
@@ -46,14 +44,11 @@
     "prismjs": "^1.5.1",
     "react": "^16.0.0",
     "react-dom": "^16.0.0",
-    "react-frame-aware-selection-plugin": "^1.0.0",
-    "react-frame-component": "^1.1.1",
     "react-hot-loader": "^3.1.3",
     "react-portal": "^3.1.0",
     "react-router": "^2.5.1",
     "react-router-dom": "^4.1.1",
     "read-metadata": "^1.0.0",
-    "read-yaml-promise": "^1.0.2",
     "rollup": "^0.55.1",
     "rollup-plugin-alias": "^1.4.0",
     "rollup-plugin-babel": "^3.0.3",
@@ -67,16 +62,13 @@
     "rollup-plugin-uglify": "^3.0.0",
     "slate-collapse-on-escape": "^0.6.0",
     "slate-soft-break": "^0.6.0",
-    "slate-sugar": "^0.6.1",
     "source-map-loader": "^0.2.3",
     "source-map-support": "^0.4.0",
     "style-loader": "^0.20.2",
     "to-camel-case": "^1.0.0",
-    "to-title-case": "^1.0.0",
     "uglifyjs-webpack-plugin": "^1.1.8",
     "webpack": "^3.11.0",
-    "webpack-dev-server": "^2.11.1",
-    "yaml-js": "^0.2.0"
+    "webpack-dev-server": "^2.11.1"
   },
   "peerDependencies": {
     "slate": "*",