Shortcut for logging vars.
Changed method.
vars() now accepts many arguments instead of a single array.
Improved missing tr error msg.
Now shows translation defaults, if any,
Allow to pass options.
Changed not() and equal() methods.
Now accept an array of attrName=>value pairs.
Added uniqueness validation.
Changes in validations.
* An instance of Validator is created per-class.
* Changed the way validations are initialized.
* More.