Add coffee-script and babel in build/package.json

...and use the same versions found on the root package.json.

build/package.json

@@ -2,9 +2,12 @@
   "name": "atom-build-scripts",
   "description": "Atom build scripts",
   "dependencies": {
-    "electron-packager": "^7.3.0",
+    "babel-core": "5.8.38",
+    "coffee-script": "1.8.0",
+    "electron-packager": "7.3.0",
     "fs-extra": "0.30.0",
     "glob": "7.0.3",
-    "mkdirp": "0.5.1"
+    "mkdirp": "0.5.1",
+    "npm": "3.10.5"
   }
 }

package.json

@@ -17,7 +17,7 @@
     "async": "0.2.6",
     "atom-keymap": "6.3.2",
     "atom-ui": "0.4.1",
-    "babel-core": "^5.8.21",
+    "babel-core": "5.8.38",
     "cached-run-in-this-context": "0.4.1",
     "chai": "3.5.0",
     "clear-cut": "^2.0.1",