Make it possible to generate URLs with multivalued parameters in the
href() subroutine, via passing reference to array of values.
Example:
href(action=>"log", extra_options=>["--no-merges", "--first-parent"])
Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>