* Added support for persistent configuration variables at runtime.
* The $_user and $_loggedIn variables are not always and automatically set in Views and Layouts.
* The Database transaction() method will now forward the Closure's return value to the caller.
* Pretty error pages are now part of the framework core and exist for all error codes.
* Sessions now support the ->loggedIn property.
* Sessions will now properly return true when checking isset() on loggedIn, id, auth, or user properties.
* Added additional documentation to various classes.
* str_random now accepts custom character sets.