begins support for email in json response and fixes discrepencies with the official documentation of the api
Ony show the authenticated user's email in the json representation
add default null token to fix giftbar app calling _user_as_json without token
added convenience method to get the user_id from the token if exists, and DRYed up a bit
Merge pull request #3 from Feeligo/rc-2.2.3

Adds support for email in user JSON representation, fixes minor discrepancies with API specification