port tornado commit 982554e710344b498887.
port tornado commit 982554e710344b498887.

Added RequestHandler.get_arguments(), which does the same normalization
as get_argument() but returns a list for repeated arguments.

fiorix/cyclone,fiorix/cyclone,lextoumbourou/cyclone,dpnova/cyclone,shirk3y/cyclone,dpnova/cyclone,shirk3y/cyclone,lextoumbourou/cyclone,dpnova/cyclone,lextoumbourou/cyclone,shirk3y/cyclone,fiorix/cyclone,dpnova/cyclone