Add a flag to disable fullscreen.

This also updates the usage of surf to represent the current status.
Thanks Alexander Sedov for the suggestion, but you forgot the manpage
entry so I did this patch.

surf.1

@@ -3,7 +3,7 @@
 surf \- simple webkit-based browser
 .SH SYNOPSIS
 .B surf
-.RB [-bBfgGiIkKnNpPsSvx]
+.RB [-bBfFgGiIkKnNpPsSvx]
 .RB [-c\ cookiefile]
 .RB [-e\ xid]
 .RB [-r\ scriptfile]
@@ -35,6 +35,9 @@ Reparents to window specified by
 .B \-f
 Run surf in fullscreen mode.
 .TP
+.B \-F
+Disable to run in fullscreen by default.
+.TP
 .B \-g
 Disable giving the geolocation to websites.
 .TP