Revert "Import the ReverseProxied class from fas_openid and use it on nuancier-lite"

This reverts commit fb5c0e1441c3c2be81bcfc3dd3dd8349214c9fb3.

We figured the bug was that we didn't run the latest version of flask_fas_openid
Revert "The ReverseProxied should be set before the call to FAS"

This reverts commit bea9a1eec4a1e3a67ce4a7c44ca6477f820783d8.