Note that "-g" no longer uses an equals '=' sign for its optional
arguments, but "--reflog" still does. This is normal behavior for parse
options, as arguments to "-g" are put immediately after the option with
no space.

For example

    git show-branch -g=4

is now

    git show-branch -g4
Signed-off-by: NStephen Boyd <bebarino@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>