Update to fxa-crypto-relier 2.3.0 everywhere (#1126)

Author: vladikoff

.gitignore

@@ -8,4 +8,5 @@ web-ext-artifacts/
 test/dist/*
 ckeditor-build/build/*
 build/
+native/app/vendor/fxa-crypto-relier.js
 *.log

native/app/utils/sync.js

@@ -14,7 +14,6 @@ import {
   TEXT_SYNCING,
   ERROR as ERROR_MSG } from './constants';
 
-// TODO WARNING: `jose` is not in the official release in the crypto-relier
 const jose = fxaCryptoRelier.OAuthUtils.__util.jose;
 
 let syncDebounce = null;