Pre-compile sources after npm install and use compiled version for npm start

Author: yamalight

.gitignore

@@ -1,3 +1,4 @@
 node_modules/
 server/db/
+server/lib/
 npm-debug.log

server/package.json

@@ -4,11 +4,13 @@
   "description": "Experts REST backend",
   "main": "index.js",
   "scripts": {
-    "start": "node index.js",
+    "start": "node lib/index.js",
+    "debug": "node index.js",
     "db:start": "node util/db/start",
     "db:stop": "docker stop expertsdb",
     "db:rm": "docker rm expertsdb",
-    "test": "eslint src/ && node test/index.js | tap-spec"
+    "test": "eslint src/ && node test/index.js | tap-spec",
+    "postinstall": "babel src --out-dir lib"
   },
   "keywords": [
     "rest",