Merge pull request coreos#337 from ericchiang/static

oidc: add StaticKeySet

Merge pull request coreos#315 from ericchiang/issuer

oidc: add option to override discovered issuer URL

Merge pull request coreos#286 from ericchiang/v3-cherry-picks

Various cherry picks from v2 onto v3

Merge pull request coreos#247 from ericchiang/mod

*: add a go.mod file and migrate to v3 package

Merge pull request coreos#231 from ericchiang/revert-go-mod

Revert "*: add a go.mod file"

Merge pull request coreos#227 from ericchiang/algs

*: pass algorithms a provider supports to the verifier

Merge pull request coreos#210 from Bisnode/Honour-nbf-claim

Honour nbf claim if present in ID token