default ingress values are broken for nginx controller

[gurpalw]

I raised this issue: #166 which was supposed to fix compatibility with aws alb's.

It achieved that goal but also introduced breaking changes for those using the nginx controller as outlined in the comments to the PR here: #180 (comment)

the default values now do not work for nginx controller, and the ingress path has to be changed from /* to / in order for the ingress to not return a 404.

we should document both.