[PATCH 0 of 2] Implement #fsize and #flastmod SSI commands

[Matwey V. Kornilov]

Hello,

This series implements SSI fsize ans flastmod commands.

Updates from the previous version
    http://mailman.nginx.org/pipermail/nginx-devel/2017-May/009914.html
are the following:

1) fixed misc style issues using Maxim's proposed patch
2) fixed issue when multiple #config commands are happens on the page