remove foo file :>
initial implementation for reverse
instance_name is not used anymore
add *args, **kwargs to Application.register to be able to pass supplemental parameters to sub_class
useless import
error responses are now in application this is minor subject one can override inherit sub and override __call__ to implement local error pages (which can be useful for a multi domain setting)
rename **kwargs to **context in render parameters because that what it is (plus request)