Fixing tex example

Summary:
**Summary**

Fixing issue #1408
Closes #1504

Differential Revision: D6924656

fbshipit-source-id: 6f12a01c1bed709cfb7da601b1dbf404d5b038a3

Author: guilhermecvm

examples/draft-0-10-0/tex/.babelrc

@@ -0,0 +1 @@
+{ "presets": ["es2015"] }

examples/draft-0-10-0/tex/package.json

@@ -1,21 +1,24 @@
 {
   "private": true,
   "scripts": {
-    "start": "babel-node ./server.js",
-    "postinstall": "npm install ../../.."
+    "start": "babel-node ./server.js"
   },
   "dependencies": {
     "babel": "5.8.23",
     "babel-core": "^6.8.0",
     "babel-loader": "^6.2.4",
     "babel-preset-es2015": "^6.9.0",
     "babel-preset-react": "^6.11.1",
+    "draft-js": "file:../../../",
     "express": "^4.13.1",
     "immutable": "^3.7.4",
     "katex": "^0.5.1",
     "react": "^15.0.0",
     "react-dom": "^15.0.0",
     "webpack": "^1.10.5",
     "webpack-dev-server": "^1.10.1"
+  },
+  "devDependencies": {
+    "babel-cli": "^6.18.0"
   }
 }

examples/draft-0-10-0/tex/readme.md

@@ -0,0 +1,15 @@
+# TEX
+
+The TeX editor in the Draft repository provides a live example of custom block rendering, with TeX syntax translated on the fly into editable embedded formula rendering via the [KaTeX library](https://khan.github.io/KaTeX/).
+
+### How to run
+
+```bash
+# in draft-js folder
+yarn
+cd examples/draft-0-10-0/tex
+yarn
+yarn start
+```
+
+which will open a server listening on [http://localhost:3000](http://localhost:3000)