store email + accessToken in model on oauth-credentials
Merge branch 'master' of https://github.com/UWNetworksLab/uproxy-common

* 'master' of https://github.com/UWNetworksLab/uproxy-common:
  update node-xmpp to use promise-based socket api.
  update identity to extablish xmpp client on oauth
  update app to pass oauth to identity provider.

Conflicts:
	uproxy.js