Handle multiple errors on the stack
Merge pull request #541 from public/fix-466

Handle multiple errors on the stack
Include the fernet vectors in the sdist

We include the other vectors, so consistency!
Merge pull request #542 from alex/include-fernet-vectors

Include the fernet vectors in the sdist
Link to our issue tracker in the readme
Merge pull request #544 from alex/issues-in-readme

Link to our issue tracker in the readme