Replace estraverse with estraverse-fb

Hopefully helps with:
#3 (comment)

Author: papandreou

lib/i18nTools.js

@@ -3,7 +3,7 @@ const memoizeSync = require('memoizesync');
 const esmangle = require('esmangle');
 const esanimate = require('esanimate');
 const escodegen = require('escodegen');
-const estraverse = require('estraverse');
+const estraverse = require('estraverse-fb');
 const i18nTools = {};
 
 function replaceDescendantNode(ancestorNode, oldNode, newNode) {

package.json

@@ -32,7 +32,7 @@
     "esanimate": "^1.1.0",
     "escodegen": "^1.8.0",
     "esmangle": "^1.0.1",
-    "estraverse": "^4.2.0",
+    "estraverse-fb": "^1.3.2",
     "lodash": "^4.16.1",
     "memoizesync": "0.5.0",
     "optimist": "0.6.1",