Implement the mechanics of fxa login on android, but don't show ui fo… (#1000)

* Implement the mechanics of fxa login on android, but don't show ui for it yet. Also, scopedKeys are not yet implemented.

* Hopefully fix the package-lock conflict?

* WIP on android scoped keys

* Finish implementing login.

* created android/user.js to handle android logins

android/generateAndLinkBundle.js

@@ -3,7 +3,7 @@ const path = require('path');
 
 child_process.execSync('npm run build');
 child_process.execSync(
-  `cp -R ${path.resolve(__dirname, '../dist')} ${path.resolve(
+  `cp -R ${path.resolve(__dirname, '../dist/*')} ${path.resolve(
     __dirname,
     'app/src/main/assets'
   )}`