Update babel and co.

Summary:
This update is necessary in order to update to [Flow 0.34.0](https://github.com/facebook/flow/releases/tag/v0.34.0) - which has new syntax to annotate [variance](https://flowtype.org/blog/2016/10/04/Property-Variance.html). The new syntax is available starting in [babel 6.18.0](https://github.com/babel/babel/releases/tag/v6.18.0) and [babylon 6.13.0](https://github.com/babel/babylon/releases/tag/v6.13.0) - both must be used in conjunction.

Transitive dependencies were also updated, otherwise `node_modules` wouldn't dedupe enough (increasing from ~225MB to 300+MB).

This diff copies D4051237.

Reviewed By: yungsters

Differential Revision: D4113693

fbshipit-source-id: 0b834683a9930822f5f77099858c6e5484c09e7c

package.json

@@ -138,19 +138,19 @@
     "absolute-path": "^0.0.0",
     "art": "^0.10.0",
     "async": "^2.0.1",
-    "babel-core": "^6.17.0",
-    "babel-generator": "^6.17.0",
-    "babel-plugin-external-helpers": "^6.8.0",
+    "babel-core": "^6.18.2",
+    "babel-generator": "^6.18.0",
+    "babel-plugin-external-helpers": "^6.18.0",
     "babel-plugin-syntax-trailing-function-commas": "^6.13.0",
-    "babel-plugin-transform-flow-strip-types": "^6.14.0",
+    "babel-plugin-transform-flow-strip-types": "^6.18.0",
     "babel-plugin-transform-object-rest-spread": "^6.16.0",
     "babel-polyfill": "^6.16.0",
     "babel-preset-es2015-node": "^6.1.1",
     "babel-preset-fbjs": "^2.1.0",
     "babel-preset-react-native": "^1.9.0",
-    "babel-register": "^6.16.3",
-    "babel-types": "^6.16.0",
-    "babylon": "^6.13.0",
+    "babel-register": "^6.18.0",
+    "babel-types": "^6.18.0",
+    "babylon": "^6.13.1",
     "base64-js": "^1.1.2",
     "bser": "^1.0.2",
     "chalk": "^1.1.1",