Merge pull request atmos#46 from atmos/single-sign-out

Add basic single sign out support for GitHub properties

explicitly require json for verifier marshaling

cut version 1.0.3

cut a version 1.0.2 gem

Merge pull request atmos#37 from atmos/handle-multiple-x-forwarded-pr…

…otos

Handle multiple X-Forwarded-Proto headers

Merge pull request atmos#35 from atmos/move-to-one-oh

Cut a 1.0 release

update license file

bump version for fixups

put it all on one line

version bump for new feature