Adds stormpath error object to the failure reason.

[jamesblack]

so that it shows up in info, incase the application needs any of the information in there.

An example use case, the application needs to handle "account failed because not verified" this will now expose that on the info so it can be used.

[jamesblack]

It would be great if this could also get a release if the repo is at a point where that could happen, it doesn't break any backwards compatibility.

[ksmithut]

I think it would be good to expose this info. +1

[dncrews]

:+1: