Revamp auth and authPage

[meghprkh]

Currently the requests are handled by authPage and auth's login function only takes the token.

Instead IMO its is better to isolate the login entirely into auth and let authPage do the work of fetching the values from the form and passing it to auth. So basically have the following two functions in auth.login (email, password, callback) and auth.register (email, password, name, callback) and let them do the requests to the backend also.

Callbacks ref: http://javascriptissexy.com/understand-javascript-callback-functions-and-use-them/