Fixing code style

New lab linting caused travis to fail. This updates to latest lab and fixes all current code style errors.

Moving to Node 4+ and ES6

This release moves to adopt ES6 language conventions, and so now requires Node 4+.

Added storeBlank option

You can set storeBlank to false, and sessions will not be generated until something needs to be stored. This keeps from having to store empty sessions in cookie or server cache.

Set now returns a value

v4.1.0

4.1.0

Fixing HTTP 400 errors on bad cookies

In v3.x, if a cookie was invalid the server would respond with a HTTP 400 error. This would happen if you ever changed your server password. Starting in v4.x we silently discard those bad cookies and start with new session cookies.

Fixing tests

This was a patch release just to get tests working again.