Many, many enhancements. You're best off browsing the commit.

Auth plugin:
    * Keeps track of login sessions
    * Permissions handler can check permissions entirely based on strings
Factoids:
    * Updated for new Web contrib plugin
Storage:
    * Files can now report their last modified time
Command manager:
    * Removed the multiple auth handlers, now we can only have one
Merge remote-tracking branch 'origin/master'