New functionality

fn:serialize! With the help of @rrthomas we now support fn:serialize. Be sure to pass a serializer to your evaluateXPath calls before you can use it
Better buckets. When parsing a selector like self::*[self::p], the stronger name-p bucket will be reconized as the bucket for the whole selector, improving performance
Passing an AST to evaluateUpdatingExpression is now supported
Namespaces are now annotated in an AST, making it possible to nest ASTs with different namespace configurations into each other

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