Removed XML::Lexer#buffering?
Removed XML::Lexer#buffering?

Instead of wrapping a predicate method around the ivar we'll just access it
directly. This reduces average lexing times in the big XML benchmark from 7,5
to ~7 seconds.

altmetric/oga,jeffreybaird/oga,ttasanen/oga,altmetric/oga,dfockler/oga,altmetric/oga,ttasanen/oga,dfockler/oga,dfockler/oga,dfockler/oga,YorickPeterse/oga,ttasanen/oga,jeffreybaird/oga,jeffreybaird/oga,YorickPeterse/oga,altmetric/oga,ttasanen/oga,altmetric/oga,YorickPeterse/oga,YorickPeterse/oga,dfockler/oga,jeffreybaird/oga,ttasanen/oga,YorickPeterse/oga,jeffreybaird/oga