fix __repr__ for Binding and subclasses
fix __repr__ for Binding and subclasses

PyCQA/pyflakes,timothycrosley/frosted_original_fork,hugovk/frosted,hugovk/frosted,timothycrosley/frosted,janusnic/main-pyflakes,jayvdb/pyflakes,mattcaldwell/frosted,epsy/pyflakes,asmeurer/pyflakes,timothycrosley/frosted,bitglue/pyflakes,nikolas/pyflakes,pyflakes/pyflakes,saper/main-pyflakes