remove RemoveAllBefore from cahcing API -- let cache impl do its own cleanup
update to new token cache interface; implement cache item expiration logic
Ignores casing on the scheme comparison
Merge pull request #116 from pmhsfelix/master

Ignores casing on the scheme comparison
Added OidcClient
OidcClient cleanup
Added UrlEncoding and certificate validation
Removed sync methods in OidcClient