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
Merge pull request #1 from thinktecture/master

sync from main thinktecture:master
Resolves runtime error due to Jwt not 3.0.0

At runtime the CodeFlowClient app was failing to deserialize the JWT due
to the Thinktecture.IdentityModel.Oidc.dll referencing
System.IdentityModel.Tokens.Jwt nuget 3.0.0 but the CodeFlowClient was
using 1.0.0
Merge pull request #545 from eldiosyeldiablo/master

Resolves runtime error due to Jwt not 3.0.0
Merge remote-tracking branch 'upstream/master'