To do so, we clear the webview history once the login process is complete so that the intermediate redirect urls used by the login process are not in the history.
Also, update the versions of some of the libraries we use.
* 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