Release 2.3.31
Release 2.3.32
Release 2.3.33
add User#anonymousId
analytics add anonymousId support
parseQuery: add ajs_aid
logout: remove anonymous id
analytics.reset(): use .logout() to preserve options
Merge pull request #401 from segmentio/anonymous-id

add anonymous-id support
anonymousId: re-generate when user id changes
Merge pull request #404 from segmentio/reset/anonymous-id

anonymousId: re-generate when user id changes
Release 2.3.33
Release 2.4.0
fix: old anonymousId is not stringified, use raw cookie
Merge pull request #405 from segmentio/fix/old-anonymous-id

fix: old anonymousId is not stringified, use raw cookie
Release 2.4.1
fix: prevent anonymousId from changing when user id is reset
Merge pull request #406 from segmentio/fix/user-id-reset

fix: prevent anonymousId from changing when user id is reset
Release 2.4.2
add cross browser tests