Reload on SIGHUP

Reload on SIGHUP

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This patch makes surf reload its pages when it receives a SIGHUP signal.
This makes it easier for shell scripts to trigger surf to reload.

I'm aware of using xdotool to trigger ctrl+r keypresses for reloading
but I wasn't able to get that to work in a general way. [1]

I'm sending this here in case surf maintainers and users would like to
include this in core - if not I will submit it to the wiki.

Regards,
Charles

[1] http://surf.suckless.org/files/autorefresh

Signed-off-by: Christoph Lohmann <20h@r-36.net>