Integrate babylon into babel workflow

package.json

@@ -30,9 +30,11 @@
     "eslint-config-babel": "^7.0.2",
     "eslint-plugin-flowtype": "^2.20.0",
     "eslint-plugin-prettier": "^2.2.0",
-    "flow-bin": "^0.53.1",
+    "flow-bin": "^0.57.3",
+    "graceful-fs": "^4.1.11",
     "gulp": "^3.9.0",
     "gulp-babel": "^8.0.0-beta.0",
+    "gulp-filter": "^5.0.1",
     "gulp-newer": "^1.0.0",
     "gulp-plumber": "^1.0.1",
     "gulp-rename": "^1.2.2",
@@ -54,6 +56,7 @@
     "semver": "^5.0.0",
     "through2": "^2.0.0",
     "uglify-js": "^2.4.16",
+    "util.promisify": "^1.0.0",
     "webpack": "^3.4.1",
     "webpack-dependency-suite": "^2.4.4",
     "webpack-stream": "^4.0.0"