updated to latest on MembershipReboot's github repo
check for null redirectUri to prevent NullReferenceException and throw a better error
Fixes build errors for ReadAsAsync in Oidc project

Fixes were to remove reference to rc nuget packages and update to latest
Merge pull request #544 from eldiosyeldiablo/master

Fixes build errors for ReadAsAsync in Oidc samples project
Merge pull request #543 from feinoujc/master

check for null redirectUri