JS: Cumbersome API calls for login and register

I was looking at the TODO app ([1]) and noticed that with the 'auth
module' the APP DEV has to specify 'contentType' and 'dataType' for
the login/register API calls. Not sure, but isn't that a bit
cumbersome?

This is not the case for any calls on the 'pipe' API, since it is
using the aerogear.ajax util (see [2]), which applies the above
'contentType' and 'dataType' as default (see [3]), which is nice!

The 'auth rest adapter', however is directly using the jQuery.ajax
without applying the same defaults (see [4]). Perhaps we should apply
the 'contentType' and 'dataType' default values for something like
login or register as well?

[1] https://github.com/aerogear/TODO/blob/picketbox/client/src/main/webapp/js/app.js#L215
[2] https://github.com/aerogear/aerogear-js/blob/master/src/pipeline/adapters/rest.js#L97
[3] https://github.com/aerogear/aerogear-js/blob/master/src/utilities/aerogear.ajax.js#L13
[4] https://github.com/aerogear/aerogear-js/blob/master/src/authentication/adapters/rest.js#L72