fix bug where expires is string should be Date
Fix bug where expires is string but should be Date

Cookies expects expires to be date, when returned from redis it's a string.  If expires is returned then make Date
cookies module uses maxage all lowercase

Bug fix: `maxAge` variable is inconsistent with `maxage` used in cookies library.  Setting maxAge will set redis ttl but doesn't set cookie expires value
https://github.com/jed/cookies/blob/master/lib/cookies.js#L96
fix expires tll, add test. fix maxage typo