Adding UserInfoClient

Adding UserInfoClient OIDC helper client that returns
IEnumerable<Tuple<string, string>> representing claims from the user
info endpoint
Returning UserInfoResponse

Returning UserInfoResponse in UserInfoClient.GetAsync to surface claims
or errors
Merge pull request #64 from billpratt/master

Adding UserInfoClient
fixed typo
updated nuspec
updated nuspec
Add timeout property to OAuth2Client and UserInfoClient (fixes #67)
added tests for controller and method
Merge pull request #68 from vegar/resource-authorization-tests

added tests for controller and method